Pain from a blowjob?

This is probably going to be an ill-formed post but here goes! Sorry if the terms I use are too crude.

I've never been able to get a blowjob or be sucked on...or a handjob without going soft. I was recently told by my boyfriend that from all the things that he see's/I tell him about, it sounds like I have the male form of Fibromyalgia. Apparently it's something that affects the nerves and how the signals are processed in the brain. My question is, could this be why I can't enjoy anything but my own hand or someone else's "rear"?

Just an hour ago he attempted to suck on me and I realized, there is pleasure, but at the same time there almost a painlike feeling from something like oversensitivity...its not exactly those though, which is confusing.

I have felt that everytime someone has tried to stimulate me, might feel a little good but then when I start to let myself really feel it to try to get into it it becomes too much and I go soft -.-

Any suggestions?

Truly an ill-formed post, yes? :p