Weight Gain??

I feel so lost. I vaped for about 8 years. I’ve had a minor eating disorder for 4, which was always my excuse for not quitting. Well, I quit on Sunday (past 72 hours yay!), but I’ve gained 5lbs. I’ve been tracking my food (every oil, sauce, drink), my calories from work outs, and I’m under maintenance. I’ve done nothing different. Why did I gain 6lbs?!?!? I’m about to buy a vape again if it makes me gain weight this fast. Plz tell me this will resolve. I’m also on 20mg of aderall. This is my worst nightmare. Idk what to do plz help.