I usually go out for walks and then shower and every time my heart rate sits around 90-100 and I feel very like on edge.

I don't think it's a heart issue because I've had heart fears all my life and I shower every morning and my heart doesn't beat fast after that. 

It's literally only like in the evening.

I guess abig part of it is when I get back im like kinda tired and my heart's beating because I walked, but the act of my heart beating causes anxiety so i can't really calm down. Same thing with evening showers. My heart rate goes up in the shower which I think is normal but then when I get out I get nervous about it which prevents me from calming down.

And it's been a while like this. I basically have to apce around for like 1-2 hours to calm down.

What do I do about this