Has anyone else been through something like this? Anxiety or something else?

I’m 22 years old, been on the birth control for 6 years (no problems with it), slightly overweight (5’7 170 lbs) and have been getting panic attacks for about 2 months. I wrecked and totaled my car (because of ice) this winter and I was unharmed. My Dad died over two years ago. I am getting married this summer, but I do not FEEL stressed out. I feel like the wedding and all that will be fine. However, I have this impending sense of doom that I am just going to die. Whether it be from a brain aneurism and my latest was a blood clot in my leg. Every little pain I feel I think it is the end for me, and naturally this triggers the anxiety. I started going to the chiropractor and he says I have subluxations in my neck, a lot of muscle problems and that is what causes my “head twinges” as I have taken to calling them, for which I jumped to calling it brain aneurisms before I had my MRI to tell me nothing is wrong with my head. I just want to know if ANYone else has been through something like this and what your solution was. I am so tired of not being me anymore. I can’t stand to be alone (for fear something will happen to me while I’m alone) and I used to be such a normal, smart, and rational person. Help please.