I had a gastric balloon procedure 4 days ago. Until today I get so much cramps and vomit?

Cramps are so annoying and severe. They don't seem to get better. Also when i have water now, i retain it in my tummy even for the next 6-8 hrs then i vomit the same amount that i had. It seems that nothing passes down from my stomach to intestines. Am i suppose to take this as a norm? PS: the doctor told me that a small plastic piece that covers the balloon slipped down to the stomach during the procedure and i'm suppose to vomit it but haven't noticed it until now Plz help me i am desperate

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