I Can't Relax

I can't relax, ever. I can't chill. I never feel good. My mind is never in peace. I am always anxious, always in a hurry, always unhappy with the results of what I do. Even when I see how good I'm doing and I realize the improvement I'm never happy and peaceful in my heart. I can't just lie down, I can't just go for a walk, I can't just be alright. There is a dull pain somewhere in my head that prevents me from enjoying anything fully. I feel even more horrible because of it, cause I constantly blame myself for ruining my own time, my vacation, my day.
I have no idea how to get rid of that feeling, I need help.