Hi, Pumpkine, and welcome! Yes, I agree with Chutz that you need another doctor. I see a board certified Internist but many use rheumatologists. The good thing about an Internist is that they are like a general practioner but have more education. Make sure they are board certified and if they are diplomates, that's even better. They have to take regular tests on all the new things in medicine in order to keep the title of diplomate, I believe.
Link number 12 in the Fibro 101 thread talks about getting a good doctor. It would be good to get copies of your medical records from your doctor. You can tell them you are keeping a file of your health problems and tests that have been run. Having these records might keep you from having to go through the same tests again.
You might want to see a gastroenterologist, too. The fact that you are losing weight should be checked out. They can help you get control of the diarrhea and then you would be feeling better.
I am glad that you found us and joined in. Let us know if you find a doctor. We really do care. Hope to hear more from you soon.