WHY, WHY, WHY DO I HAVE TO HAVE PANIC ATTACKS?

This is something that I know noone can answer but I just want to scream "Why?!!!!" I'll be going along doing fine and then for no reason my life is stopped by the fear, anxiety and panic attacks. Yesterday and today my life has stopped. I have things I need to do and I just feel so scared. I got into my car to go do some work at my old house and just couldn't go. Ha! And I thought I was doing better. Really? So, why? How many years, how much therapy, how much and how long do I have to fight this? I just want to throw something. I can't stand it. It's not for lack of trying. I just can't get over this. I'm so mad, so sad, so frustrated and so heartbroken.