Since I have been in FL MY POUCH HURTS! I have some ? can you help me out

OK since I have been in FL I had to drink alot of TAP water, Since then I have had ungodly pain and nausea, Throwing up very little but still not able to eat much mainly soft things like yogert and oatmeal my protein drinks and propel.  Is it possible that I could have H Ployi or a ulcer or do you think because of the stress its just acting up?  I have had to take alot of promethize and have asked my pcp to call in Zofran instead, the promethize knocks me out. have any of you gone through this,  I am almost 18 months out. Any help or ideas you all can give me.  if it doesnt start to get better soon I will call the gastro doc and see him for an ENDOSCOPY of my pouch.  Thanks for your ideas you all are great

love Annrenee