Fibromyalgia is a wide spread deep pain everywhere.
The finger thing makes me think of arthritis. Mine didn't hurt at first. I'm sero-negative psoriactic arthritis.
The gastric issues could be related or it could be a food intolerance.
Get your hands xrayed asap to rule out arthritis.
What finger thing? What of your didn't hurt at first and then it hurt?
As far as food intolerance, I have not been able to pinpoint any certain foods or type of foods. The only reason I thought of fibro, is because of the strong connection between my abdominal issues/pain and sleep. On top of that, recently my b12 was kind of low.