Am I going to have a heart attack???

Hi everyone. I'm 22. I'll be 23 next month, hopefully.

I've been dealing with anxiety for years now. My worst time was like 5 years ago when I suffered a psychotic episode from cannabis abuse. So I know really well how anxiety and a distorted vision of reality affects someone. Since then I've been doing better. Until last week...

I had the strangest panic attack ever. I was cooking dinner with my mom when I suddenly stoped feeling my left arm, like, completely. I started freaking out but manged to push trough for a bit. Eventually, the stress got so intense that my blood preassure went down really fast to the poitn were I almost passed out. My parents quickly brought me to ER, but like not in a hospital, just a clinic. They checked my blood preassure and my pulse and said that everything was fine and that I just needed to relax and get some sleep.

Next day I woke up with a weird feeling in my arm, like some kind of tinggles and some pain now and then. I went all day trying to ignore It but I was extremely paranoid so I went again to the ER, this time by myself. They told me again that I was fine and that I had nothing to worry about. They told me that maybe It had something to do with a damaged nerve on my arm or even my neck/back.

Having this information, I decided to finally go to the hospital to get some tests done. They did a quick blood test, an electrocardiogram and a neck x-ray. Everything was fine, but the x-ray showed that I have a bit of cervical hyperkyphosis (my neck is more curved than It should be) and that MAYBE It's pinching a nerve and causing all of these issues.

My family doctor took all of the results and decided to prescribe me pregabalin. She said that It will help me with my issues right now, including the absurd amount of anxiety I've been dealing with since the first episode.

It's only been two days since I started taking pregabalin and I don't expect It to work like a magic pill from the first time I take It, but I just can't take It anymore.

My left arm feels weird almost all day, I feel tired even tho I've been less active this last week, I have sharp chest pains, they only last for a second but It feels like someone is stabing me on the chest, my neck also hurts and I've been having heartburns for almost 4 days now. I'm always paranoid that something's wrong with me and that a really terrible thing is about to happen. I've never experience so much anxiety in my life, not even when reality literally broke apart right in front of me. I really don't want to feel like this, It's tiring.

Am I going crazy? Am I really having a fucking heart attack? I'm so tired.