I need some reassurance that I'm not the ONLY person who feels this way.. and maybe some tips on how to help?

I'll start by saying I have had anxiety since I was a kid, it had gotten so bad that I thought I was having a heart attack, turns out it was just a panic attack and was prescribed antidepressants. (When I was 18.)

I'm 22 now, and ever since my daughter was born (Now 13 months) I have had the WORST fear of dying and leaving her. It has gotten so bad that sometimes it keeps me awake at night, sometimes I just ball my eyes out because of it, it makes me overanalyze every single thing. I've been having a pain in my arm, I keep thinking I'm going to have a heart attack and die. Sometimes I think I'm going to be diagnosed with cancer and die. I had a bruise on my leg from a nasty fall, I thought I was going to get a blood clot and die and just so many more scenarios! I just have this fear of death and I know it is a justifiable thing to be scared of BUT IT CONTROLS ME! Please tell me I'm not the only one who feels this way?! I feel crazy!