Reply to first post:

Have you seen a neurologist? Sounds like you need a full neuro exam (they can assess your sensory deficit of sensitivity to sheet/clothing with more qualitative tests).

I've had "peripheral neuropathy" for a year now and although it starting in hands/feet, I later developed stinging, burning, shooting pains in my groin, back, and breasts. Your internal thoracic nerve (also called mammary nerve) runs along the inside of your chest, very superficially compared to other chest-cavity nerves, which leaves it susceptible to hypersensitive symptoms.

Hope to hear more

-J