23 male, 5ft 11, 140 lbs. Life long anxiety

I was listened to with a stethoscope and had an ecg at the start of june. The doc said he saw LHV but that he wasn't concerned and everything was good for my age. 

But im still worried about my heart. I notice late at night it'll go down to like mid 50s and when im in bed I legit can barely feel it. but in the morning its like fluttery almost.. like usually after the shower my heart is like weak and fast usually like 100-120 beats. is that normal? Also post workout my heart rate is also weak but fast and can stay that way for like an hour sometimes? 

These past 3 months i've talked to so many people with similar experiences but I keep stressing and I dont know. I cant get more tests. I keep thinking I want like a stress test and holter just in case and im worried about that LHV thing. Like he said I look good enough but idk. I've been sedentary for years now and like 2 months before this fear started I started walking outside for like an hour a day and even went to the gym for a month. Then I got crazy stressed and attached to heart fears.

I was fine on the daily 1-2 hour walks other than some very slight shin soreness. I was mostly fine at the gym but I would still panic if my heart rate went up a bit high or wouldn't go down when I wanted it to. 

now I feel scared to even go on walks. im so scared of getting my heart rate up. Even when I stand and it spikes up I get like nervous. I've been getting a bit better but every time I like manage to successfully ignore one "symptom" I feel like theres another one that pops up.

I get tight breathing that comes and goes. sometimes just sitting, a lot of the times when I walk or do any like simple activity. Sometimes its bad other times its fine. Idk if thats anxiety or if my hearts going bad within months. 

I've had heart fears my entire life but it got super bad these past 3 months. 

My chest and throat have sometimes been tight from anxiety but now it feels a lot more and I keep looking up symptoms and I just dont know. Again, I feel like one thing gets better so my bodies like yeah no lets keep it up and then I panic over some other variation. 

[https://ibb.co/vhvkNHF](https://ibb.co/vhvkNHF)

here's a picture of my heart rate while shopping at 3 stores about 2-3 weeks ago. Is there anything concerning on there?