I've had this problem. Worked in a grocery store. Cut my finger while wearing gloves. Didin't cut the glove. Glove was full of blood and I didn't know I'd cut myself. Another time I'd been burning trash/tree branches and burnt my hand on one of the branches when I threw it on the pile. Didn't know I'd burnt my hand until the next day when I noticed what I thought was a rash. Can't feel bugs crawling on my arms or legs eigher. But have the sensation of them crawling when they are not there. Crazy body!

Half of my back is completely numb to touch and I don't know why

Tip; Ice packs on the wrists and hands (no more than 5 minutes per hour) It helped to reduce inflammation in my hands and speeds up the return of feeling in my fingers.

Not feeling any pain sounds like neuropathy, are you by chance a diabetic? Neuropathy is often seen in diabetics but people with other ailments can have it too. It can be dangerous because not feeling any pain when you get hurt can lead to injuries that are not attended to as you don't even know you hurt yourself. I would talk to your doctor and get some tests done.

Wow really? thanks everyone for the info...I never would have known hmmmm now that I think of it...I have found cuts or bruises and don't remember how I got them..or is that not really the same. no numbness. Wow the more I learn about fibro the more I pray for a cure to come.. I am almost tending to agree with DavidM maybe its another type of nerve disfunction...well I hope some one comes up with some answers soon! Take care all