puresauciness

So the deal with my recent bad days has mucho to do with work. I work for a small company and the only person above me is the owner. The problem is that he makes me feel so insecure about my abilities that it is carrying over into other aspects of my life. He forces me to second and triple guess my work (as well as my personal life) and I can't seem to let it all roll off my back. I want to go get another job, but I have these AMAZING hours that actually allow me to go to school full time and work part time and get a better than decent paycheck. I am seriously messing up on small things all the time now. I know what I am capable of. It just seems like there is an enormous road block. I am having something like panic or anxiety attacks (i think) whenever I start to worry about stuff related to work. I just want to be good at it, ya know?
Regular, normal people just deal with having asshole bosses. Why does this break me down?