64 year male 190 pounds 6 ft feeling crappy heartrate seems off

My heartrate seems to go up and down alot but my device still gives me an avg 24 hour resting rate of 61 consistently, lowest it goes sleeping is 50 highest when active 135, eating seems to really make it spike , not the normal 5-10 points for a few hours like it used to after a meal but more like 20-30 at times, bloodwork came back from a month ago doctor wants some test, calcium is high and creatine, I've been taking creatine supplements for 2 years, guess I should stop taking those, any advice, my appointments not for a week and I have felt weakness in legs and some trembling in limbs.

Oh I have no diagnosed health issues and am on no medications