First I just want to applaud you for being brave enough to be honest and ask for help. I have not been in your situation so I don't have much advice, but can you bring a reliable friend with you when you go to bars or clubs? Someone who can make sure you go home, alone, safely? (As it's sometimes called jokingly, the "we gotta go" girl?) Maybe you could also make a promise to yourself also that you will not have sex without a condom? Carry them with you all the time.
I would also make sure you're watching out for your safety in other ways when you are out partying too -- make sure you never leave a drink unattended, never drink anything you didn't watch the bartender pour, have a designated driver, etc.
Sex can be fun, but if you aren't feeling good about yourself in the morning then it is not worth the risk, and you know that you aren't doing it because it's fun but for some other reason (like self esteem issues).
If you can't see a therapist until September, do you have any free sources of therapy you could consult? If you are religious, you can often get counseling from a pastor, priest, or rabbi, even for non-spiritual problems. If not, there may be a help hotline you can call or a women's center. Planned Parenthood may be able to provide low-cost counseling (for sex-related issues) or refer you to someone who can. They can also test you for HIV and other STDs (even if you don't think you have any, it is a good idea to get tested).
I hope things work out for you! Please keep us updated!
08/10/2005: 140 lbs 
11/28/2005: 130 lbs! 
