I KEEP GAINING WEIGHT - PLZ HELP!!!!!!!!!!!!!!!!!! (10 PTS)!!!?

I used to weigh 110 pounds. I have been very stressed about not having a date for prom & I have gained a lot of weight. I now weigh 135, have this huge fat roll, and can’t fit into my clothes. I just keep stuffing my face out of stress & my stepmom keeps making treats when I go to see my dad on purpose b/c she wants me to gain weight (sick I know). Suggestions? Thx!