Hey all, I'm new here but I need some help

Lots and lots of it!
So - my bing confession: Last night -
Didn't take lunch to work - thought it'd be okay but I got hungryyyy - so I had a friend buy me a sandwich, icky, mayo filled, but delish sandwich. I threw away one piece of bread etc etc, and was good.
Then I came home, and had my grilled lamb, cooked one piece for lunch tomorrow - but somehow, i ate it.
Then I had to go get some groceries, and somehow managed to get a donut also, ate that on the way home.
At home, I had...half a box of chocolates, and about 4 pieces of toast. Then I purged....which is something I haven't done in about 6 months.
Then I talked to the boyfriend, having issues at the moment and I decded it would stop there.....but noooo..... I continued by having a bowl of noodles,slice of bread, the rest of the box of chocolates, then ripped into a bad of chocolate pieces and ate like half of that.
Awwww man, I feel so embarassed. So alone, and so useless. I can't believe this happened again, it had been so damn long since it had, I thought I was okay, but I'm not.