Did all three symptoms begin around the same time?
All three together could point to a number of things...
Can you be more specific of your symptoms and if eating helps or makes the pain worse or not. Where in your stomach does it hurt...upper, lower, middle, left, right...
Fatique...are you getting restful sleep?
Metallic taste...dental issues can cause this as well as other disorders like gastritis, GERD, mercury poisoning, etc...
Best wishes,
Zig