Hi Natalie.
I've wanted to reply for a few days but my own head just wasn't in the right place, but it is now, so here goes. Well done for resisting the binge the other night, how did you distract yourself? I think you've made a good choice about going to the doctor, sometimes it really helps to get things off your chest. After I had Imogen and suffered post-natal depression, it took a hell of a lot of courage to make that appointment, but felt so much better for just doing that.
If the doctor gives you some tablets, they'll most likely be something called SSRI's (Selective Serotonin Re-uptake Inhibitors) which have little abuse potential, ie. you can't really get addicted to them. That was one thing I was worried about when admitting I was depressed- needing them to survive. Provided you come off them gradually as directed by your doctor, you should have no problems. SSRI's are quite often prescribed (along with other treatments) for various mild eating disorders too, so they may be brill for you. As you may have guessed, I did about of background reading before I went to the doc back then, so I'll stop rambling now, but if you ever want to chat about it, just PM me hun.