Ingested alot of lake water. Ibs? What test should I get?

After that I was dizzy for 2 weeks, then had insane anxiety, my bowel movements are small maybe once a day. Bowel movements were green, now worm like with sulphur smell. Most of my crazy symptoms and anxiety are gone except my stomach growls and bowel movements are still rare and palms get really sweaty. I had blood test. would that show anything about infection or stomach disease? What should I do now?