horrible feeling that comes and goes

I get a horrible feeling in my head, it comes on whenever i try to do something. i.e. read or even look through the posts here and when i practice reiki sometimes. i live in anticipation for when i struggle. i just want things to go smoothly and to enjoy myself. i've talked to a doctor about this and he seems to think its not depression, but i get really low sometimes and feel these grim feelings in my teeth and jaw. the grim feelings last a few seconds but it is really sinister. also, i was in bed when i felt bones clicking together in my chest. when i was really ill i would think''the bones that crack'' and actually feel like all my bones were cracking in synchronicity with it. its really scary.

anybody have similar issues?

Does anyone have any suggestions of what this feeling is?

Does sound scary to feel that way about your bones. If not depression, what does your doctor say that it could be?