No Appetite, Stomach Pain. No Vomiting And Diarrhea. Any Advice?

I've been having stomach issues for over a week now. Last Friday I thought it was the flu, but didn't really have any symptoms like vomiting,diarrhea. I did make myself vomit one time and I felt better. After three days I started feeling better, but had no appetite and sometimes when I ate the pain would return in my upper center stomach, just below the breast. Last night I thought I would have to go to the emergency room, severe pain!! It lasted for about three hours. I started keeping a food diary, The only thing I ate yesterday was a piece of toast and black tea and around three I had some crackers with peanut butter and a glass of milk. I've had both last week and seem to be fine, so I don't think it's what I'm eating??? Also, wanted to say I've been taking care of a turtle the last few months - taking him outside everyday, cleaning his cage. Maybe I didn't wash my hands and caught something, I know they can carry diseases. Anyway if you can give me some advice, I would appreciate it.

Thank you
Teri