Need to vent so I can study....

Yup. I have a lot of stress right now.
One roommate is moving out on 10/31. Fine. She submitted proper notice and paid her rent for October, albeit two weeks late....
The other roommate is having raving cunt attacks.

The quick-ish version:
In January she asked if her girlfriend could move in after she graduated from school.
I said "no."

Come spring, she said she didn't want to live with her girlfriend anyway, so there was no more interest in said girlfriend moving in.

Toward mid- to late May, I came home one day to find said girlfriend there and they were taking small furniture items and clothing up to said roommate's room. I asked what was going on and I was told that the girlfriend was only staying the weekend and would be moving in with an "uncle" in Palos Verdes. Six weeks later the girlfriend was still in my house.

During this time I approached her a number of times about the fact that the girlfriend should not be there. Nothing happened.
My original roommate moved out at the end of May, so June 1st I paid double-rent and double-utilities in order to keep the house (I sublet to the roommates).
At the end of June I was fed up. The girlfriend had been living in my house for free for six weeks, without permission, and I had been been paying double. I came up with what I thought to be a VERY reasonable payment for this: One month of utilities & a small portion of rent for the month, totalling $350.00. For six weeks. My roommate paid it for her, all the while tearfully apologizing for taking advantage of me and blaming the ignorance of youth and inexperience for not understanding the situation and applicable laws. I also added that the girlfriend absolutely had to be out of the house by the end of June. She was, and a second roommate took possession of my vacant room July 1st.
The summer went on and roommate 2 was really bad about paying rent on time; as a matter of fact, she never paid rent on time.
Money went missing from my room right before roommate #1 left on vacation, most likely at the hands of her visiting girlfriend. I don't know this for sure, but there were many times that the girlfriend was left alone in the house without my knowledge. Although I lock my room when I leave, I hadn't been locking it when I was at home and in the shower, or downstairs. The only people who'd had the opportunity to see the money in my room, therefore knowing of its existence, were roommate #1, the girlfriend, my fella, and one friend of mine who'd only been in there once and had never ventured back up the stairs due an intense fear of the upstairs of my house. So, I suspect the girlfriend, as she had knowledge, access, and motive (see aforementioned $350.00).
I left for vacation for a month.
Upon my return on 9/20, I came home to the girlfriend in my house again. I didn't know how long she had been there. Roommate #2 was MIA and roommate #1 was supposedly engrossed in classes, so I didn't see her much for a day or two. On 9/22 I had the opportunity to discuss the girlfriend situation roommate #1. She assured me that she would never leave the girlfriend in the house unattended and that the girlfriend was leaving in the morning. A week later, she was still there, although trying to sneak around.
I contacted an attorney (yay for my school that have these services available for free/cheap).
Last weekend, on the advice of my attorney, I implemented house rules to avoid these abuses in the future. I spent this last weekend being verbally attacked by roommate #1 and begging roommate #2 for the October rent she had not yet paid.
The good news is, I got the rent from roommate #2 finally.
Last night roommate #1 told me that she is moving out at the end of the month with roommate #2. I told her that, although she doesn't have a written lease, city ordinance requires her to give one rental period's notice as defined by her payment schedule (so, one month).
Now roommate #1 is trying to say that she told me on the 1st that she was moving out. Now, in all of that screaming and berating last weekend, and prior discussions, she vehemently maintained that she would NOT be moving any time soon.
I'm also pretty sure that she has the girlfriend there and is hiding her in her room and allowing her to stay in the house during the day while I am at school.
She has also stopped doing her own dishes and cleaning up after herself (coffee and food spills all over the counter; I don't even eat at home).
She also keeps leaving lights on all over house, I assume in some kind of effort to drive up the electric bill before she leaves.
I just don't know what to do at this point....
I'm happy these people are leaving. But I do need to get renters in there ASAP, which can be a chore, and expensive in the meantime.
And I have a very difficult midterm tomorrow that I absolutely cannot focus enough to study for (hence, the vent here, in hopes it will clear my head).
And I have to spend the rest of the month putting up with this bullshit in my own home.
And I have to wonder if she going to break things or steal things on the way out, just to be a pill. I put no immature action past her at this point.
I don't even feel safe at home.
I've considered moving out and into a smaller place closer to campus, but it's very expensive up here and I would need a lot of time to get out of the house after over 8 years there, so Winter Break would be the best time to do it.
Anybody have any thoughts or suggestions...?
At least pass the word along about the rooms for rent.
I have an ad on roommates.com, my profile is, of course, EarlessDog.
Or they can email roommate@earlessdog.com.
Ugh.