I am having upper stomach pressure. Bloating like u cant believe. Had a bowl movement as normal yesterday and im sure i will as normal late afternoon today.i have growling in my tummy like im hungry. I ate food and i feel like it filled me up and is going no place. Only thing new is 4 days ago i started taking collagen pills for skin .over counter.no burping or gas. No feel to poop. What causes this and makes it go away. I took alka seltzer in the am. Didnt help