Realated to BP and pulse rates.

I am 35 yr old, 1.  A few days ago I was doing aerobics after a long time, to regulate my BP issue and to control my weight, but I noticed in my smart watch, that my BPM goes upto 180 per min in few min. of workout (approx 10min). I was shocked to see the pulse rate. So I suddenly stopped and my pulse rates comes down. But after a min. I again check that my BPM goes upto 50 per min. I am worried now. Is it fine to if my BPM goes upto 180 BPM and when I stop in resting position it goes down to 50 BPM. 2. Also I had medication, for approx 30 days- half tablet of AMLOSAFE 3D prescribed by doctor. But now I am having Lauki juice from 15-20 days and 5 days ago I start skipping the medicine. But sometimes my bp is lil high then normal. Please suggest me should I take the medicine as well or not. And about my above question.