for me the reason why i had this issue was clear, it was ptsd from abuse. definitely. for that it was a process of actually learning how to be present for touch after therapy for emotional issues or at least during. i would have to say that my sensitivity for pain has lowered which is actually a good thing because it means i am present for it. when i had my gallbladder out a few months ago, the surgeon said it was all scarred up from chronic inflammation that i never thought was enough pain to notice. the kidney stone was no big deal for me either, and the dry sockets made me dizzy. these are all the most painful things i know of.
i had to learn to tolerate pleasure was a better way to express that. if your issue is diagnosed first to not be medical, then maybe what works for me will work for you but i would see a doctor first!