Check! I'm like that.

When I get any positive feedback, I can manage a "thanks" now, but inside I'm busy worrying about what ELSE I'm doing wrong that they aren't telling me, or that they're just trying to be nice and pity me because really, I'm quite a horrible person and maybe this is the only good thing they could ever think of, or I am worried that they'll now have high expectations of me and that I'll REALLY disappoint them the next time.... etc etc.

I don't really know how to deal with it. I just fake it and smile and say thank you and then I will likely withdraw quite a bit until I think the "expectation" has worn off.