I spent 7 weeks there over 3 different trips. I went to this particular restaurant 2 days before my last day there. Started feeling sick the day I got home. At first I thought it was a result of 24 hours of travel. 2 weeks later I'd lost 20 pounds (from 180 down to 160) and people at work could tell the difference.
I went to the doctor and he said it was almost done running it's course and to just hang in there.