Feel like I'm being losing control again

I have been trying to recover from bulimia/bingeing/restricting for a while. Just under three weeks ago, I resolved to stop weighing myself, and I didn't binge or purge or restrict in that time. Today, I looked at my stomach in the mirror and panicked so I went to Boots and weighed myself. I had only put on a little weight in those three weeks, and still under what I should be, so I thought I would treat myself. Which started with a small apple pie and then turned into a massive binge. I threw up afterwards. This was the longest time I have ever gone with being normal, and now I feel like it's all wasted. What should I do? How can I stop this ruining my recovery for me? I am completely on my own, noone knows about my eating problems. Please help me. I thought I was nearly recovered but I really am not.