I hate this about me, but yes, I am hypersensitive. I don't respond well to certain types of input or situations, and my coping mechanisms for them can be flawed at best.
I'm very good at regulating the depth to which I feel some things and I can hide it (as I don't want to show it to everyone, it's not needed). However a certain level of it will show. If for example, if something is to go wrong at my hands (whatever it may be) I very often will respond to it really badly. I'll feel a physical gut reaction of "FAIL" and it hurts a lot. It can spin in my head for a long time, and I may need to retire from everyone to wait for it to pass. My mind is on the dramatic side of things and it can very quickly go from "bad, not good... doom... DOOOOOOM!". The likelyhood of that occuring is dependent on how many current issues have been stuffed away and buried. These can well up even if I am not actively thinking about them and compound things.
Being criticized by things that I know are sort points crushes me. No matter what it WILL hurt, and it's annoying as fuck. I just want to be able to take it and be done with it, but it doesn't work that way. I don't take it personally, it's just being faced with the truth of something elicits all kinds of nasty feelings I don't want to feel. Not every criticism hurts. It's usually only triggered when it's done by someone I value and I know they are completely right. If one of those is missing the effect is a lot less or non-exsistant.
My best weapon against hypersensitivity is rationality (trying to figure it out so I can rationalize the feeling away), and thick skin. The old saying "pull yourself up by your bootstraps" has been something I try and force myself to do as much as humanly possible. I'll keep doing that until I crack. Unfortunately it doesn't really make the feelings go away, but it at least move me to a place where I can leave them behind or work through them.
I try and hide all of this from others as much as possible, because I am just really shitty to deal with when I open this up (as no amount of talking or support will make me come around) so I have to lie a lot of the time and say I am over it. I won't be, but eventually I'll be able to put it aside.