It is possible to have a "grumbling" appendix and that can be accompanied by a low grade fever over a period of time, however after reading your dental posts I would have to wonder if the way you are feeling today is related to that even though you've had some tummy issues for a few years. Your temp and other symptoms could be coming from the tooth problem.

I'm sorry this is happening to you while you're away from home. Keep rinsing that mouth out with salty water as suggested by Bryanna. Your fever and gut issues could be related to that if it's an infection. I take it you're not on antibiotics?

as mrsD suggested, you really should see a doctor.