Problems w my stomach

So I’m in kinda a depression state and I’ve been trying to get out of it and find ways to make myself happy. But I literally didn’t eat for a whole week but I stayed hydrated. And yes I know that it’s not healthy to do that but everytime I even thought about eating it’d make me sick to the stomach. So yesterday i tried to eat something but I couldn’t finish it and like I was fine but about 30mins to an hour later my stomach was hurting so bad and it was literally like I blew up which Ik nasty. And like I just tried to eat something else but the same thing happened.