*Currently having this mild anxiety attack as I described*

Hello,

For 5 years I've had anxiety since my dad passed away when I was 15 and I never took the time to grieve. However, as someone who works in the medical field my projects are specifically to work on the medical devices that failed him. But up until like January I had never experienced true anxiety or panic attacks.

It was a few months ago when I was laying on my back after class and my heart beat dropped and since it was the first time I've ever felt that I started having a panic attack. So ever since then I've had constant health anxiety always researching every symptom and doing every check up just to be told I'm too young (20) and the test results show nothing of concern. 

I thought it was heart attack or stroke symptoms but to be honest, it's kind of rare for that to occur given my lifestyle (yes I know it can happen still) but it's fair to assume I'm good for now.

I've gotten to the point where I can reasonably assume that I elevated the symptoms psychologically which makes me think I have the symptoms I don't want. But as of late it seems I have a grip on reality again. 

Let me explain, everyday I felt fatigued and a since of impending doom (imagine the stress on a 20 year old engineer lol). For the last 2 weeks since my last panic attack I felt tired and it would go away and tired and it would go away or I felt like I'd pass out at any moment. 

I don't know why but now I feel more "normal", I don't have those same intense intrusive thoughts and I can actually enjoy my time now. There are still micro waves of anxiety but why is this? I don't know how anxiety works.