A-fib and anxiety

Sorry for the novel but i just need some opinions from people who may have dealt with something similar

So I've had undiagnosed health anxiety issues for a few years now.. usually surrounding my heart, chest pains etc.. about 6 months ago my heart was beating very fast and sporatically. Beat, 3 little fast beats, miss a beat etc.very uncomfortable. Lasted about 6 hours and I decided to go the the hospital. Right when I got there, it stopped. I decided not to go in because my heart was now beating perfectly normal. After this, I felt absolutely drained for a couple weeks. Light headed, dizzy, nervous and eventually it passed and I felt normal again. (Thought it was from panicking about the incident)

Then saturday night, my heart did it again, exact same.. I went home and tried to sleep it off again but the next morning it was still at it. I went to the hospital and they said I was in A-fib and they needed to get my heart beating normally again. The gave me some meds in IV to regulate my heart but it didn't work. They decided they needed to shock my heart with cardioversion to regulate the beat. They put me to sleep and performed it and it worked. I woke up 20 minutes later and my heart was normal. An hour later they let me go and said that I needed to follow up with a cardiologist and proceed from there.
Now it is Wednesday and I still feel absolutely horrible. My heart is beating normal but I'm totally drained, even regular tasks are hard to complete. Even looking at me, I look unwell.
The cardiologist can't see me until September. So now I don't know what to do.
Do I feel like crap because I'm now scared and anxiety is the culprit? I was just released 3 days ago from the hospital and my heart and ecg was good after the shock. They also said my blood work came back fine.

I just need to hear some opinions because I'm terrified on the inside. Feel shakey and I feel like I notice every little feeling and think I'm about to have a heart attack or something or stroke any second.
Do I feel like this because of anxiety after a tramatic event??

I'm a 28 year old male.
Help!

Thanks for your response. The issue is that I'm in a smaller city and there are only 2 cardiologists nearby. They have very long wait times.
I'm just very concerned that I could have had a heart attack or something or have blockages in my arteries because I have such a bad diet. I'm very weak, and feel like I'm in a daze all the time. I'm worried that the doctors don't think it's possible because I'm so young and not overweight.

Would they be able to tell by blood work? The doctor said my blood work came back fine... but I don't even know what tests they did.

hi, some deep breathing exercises help. do this:

sit, no noise. gently close eyes and breathe down from ya gut, not chest, inhale fully through nostrils, hold for 5 seconds, purse your lips and slowly let the breath out, repeat 2 more times.

ps, you would not be discharged if they felt you were at risk.