Whizzer
Gig'em
i gotcha by twenty or more years and it sounds like how I work. 
It's always toward the lower side. I'll connect my diesel compression gauge to my junk and see what it says.When was your blood pressure last checked?
I’d get that done asap.
Maybe a vacuum leak & running little lean? Still managed to stuff the little A/C in the bedroom window. Should get rid of that headboard & vanity mirror & build shelves. I put the AC on some totes beside the bed so not much lifting. If build shelf, could just slide it out & over? In cold weather can feel the air just rolling in on my old dome. So pull it out and put the window back together.Pulse rate is usually in the 70s so something not right.