Massive Bloat and Discomfort - Need Help!

hello all weird question but quite serious to me. the last few months I have been suffering with massive bloat. so much that you can knock on it like a door. it's quite painful and icky in my stomach. I went to er cpl days ago and they took xrays to find I have a large amount of bowels, however was sent home. I went and got magnesium citrate and drank it that night. the next day I had 8 bowel movements of diareaha. not alot of bulk. so waited one day bought another bottle drank it. one hr later I threw all of it up. now my stomach is really gross. has anyone had this problem??? and what else can be done ?? this bloating is unreal, uncomfortable, and I'm at my whits end! please help...thanks in advance.