23 male 5ft 11, 140 lbs.

Ive been having an extra bad wave of cardiophobia despite having a good ecg 3.5 months ago I've still been worried.

Today im having one of those really tired fatigue type days. Slightly light headed, slower breathing, sleepy and just drained feeling.

Normally I dont worry about this since I've had this before many many times whenever the stress gets too bad. But I noticed that in this fatigued and drained state my heart is also a lot calmer. 

Even to the point where I got slightly panicked at it being slower and more calm and less reactive, but it still stayed more calm. 

I guess im just so used to it feeling like its higher and a lot more reactive so when my body is jsut throwing in the towel and its not all stressed I feel scared of it.

on one hand I actually enjoy this little bit of calmness but on the other im worried what if its actually like heart failure or something for reals this time.

Like normally my resting rate is 70-80 with it going to high 50s during the night time. And when I stand up it spikes to like 115s and then standing and walking could be like 90-110 somewhere around that. 

But now my sitting rate is like mid 60s and my standing it like 70-90s.

It basically feels the same way my heart feels at night before bed. Very calm and slowed down, even with stresses giving me a less reaction than they would during the day. But its just that this is midday, not like 1 am

I would imagine this is normal right? the body is drained and weak, its giving less energy and less adrenaline, so even in a time of worry its like "ah whatever" but Im slightly worried what if its finally giving out?