What Causes Stomach Pain,vomiting And Diarrhea?

I m 18 years old and have had stomach problems for as long as I can remember. This past year has seemed to get more intense. About once a month and this started when I got pregnant she s now 3 months old and it hasn t gone away. I ve been to many doctors for the same problem but they all conclude to the same thing but never ran tests of any sort. The day will start out normal i ll have no pain and when I m at work it happens more but out of nowhere my stomach is in so much pain I seriously can t move I ll have the worst cold sweat and my fever will jump up to 102 then go back down to 97 this happens in a matter of 20 minutes then the pain will still be there but I can go back to work after the episode my whole right side of my body from my lower chest down is sore like i ran a lot. Oh and at this time I ll have the worst diarrea and feel as if i have to throw up but I don t actually throw up. I really feel when this happens like I m dying it s so bad. I ll call a doctor and ask if they want me to come in and they all conclude to ipendicidus but I don t stay sick and I haven t died so I don t think thats the right answer