I've got the doctors Monday about my weight and it's stressing me out so I'm bingeing :(?

Yesterday I ate toast , big bag of haribo, big bag of kit Kat things and a large kebab but after that the doctors was in my mind so I binged on weight watchers ice cream cakes and biscuits :( i never purged anything though. Today I woke up and felt sick so I left out breakfast but then I thought oh crap doctors so I went to the shop and bought so much food, and ate it all in one sitting, I had a bag of snack a jacks, a peanut er and jelly muffin, a large bag of shrimp candies, bag of skittles, bag of milky ons and a whole pack of oreos! :( I need to gain weight but I just try to get it all in one go and make myself sick! anyways will I gain weight from this? I normally eat about 200-800 calories a day, I'm bulimic and think I have a binge eating disorder.