Help! Touching things is like nails-on-chalkboard?

I have had episodes of this since I can remember. I will simply reach out to touch something and it feels painful in a nails-on-chalkboard kind of way. I literally pull my hand away and cringe. It doesn't seem to happen when touching anything in particular and I also notice it happens when I'm walking and I'm barefoot around the house. I will step and cringe in pain. It seems to be getting worse lately and I can't stand it anymore. I'm pretty sure it's the same with the rest of my body as well but hands and feet are what tend to touch things my body usually doesn't but I have had this sensation before like when brushing up against something I cringe too. I am seriously thinking about cutting my fingers and feet so that I will only be able to feel the pain from the cuts and not that cringing pain anymore. I can't stand the feel of my own skin right now!! Please help me before I do something stupid! I have hypoglycemia could it be a physical problem or is it some kind of mental problem like a body memory or something?