What was your heart rate at rest before your cycle and average heart rate during the day?
Elevated heart rate is one of the sides i fear the most. Its measures the shape of your heart. BP the shape of your veins and arteries.
If you were gtg befor your cycle, i think numbere got a point. Elevated e2 increases hear rate.
I guess your BP is ok due to your good diett.
Fixes:
Get bloods.
Tune in your AI if e2 is elevated.
Make sure you have a good ZMA-supp in your diett.
Increase cardio training. Not the walks, but train your O2, running fast in series.
Google foodtypes that naturally lowers e2 in men. Put as many as u can in your diett.
I use a controversial fix too. I used cardarine/sr9009/ to lower my heartbeat. I lowered my heartbeat easily with 20 beats pr minutt from a simple dosing protocol with those ppar`s.
Some bad tounges will say cardarine is stupid because the rats, who were given supersonic doses, got canser. Well, drop 50 tbl of aspirin ed and something bad will happen.
Study it but it dont believe suggested doses will give humans canser. By this day i have never come a cross such a report or blogginfo and there are ten thousands of guys using cardarine as we speak.
What everybody agrees on, haters and believers (well, not numbere and mr BB but those guys really dont know shit

), is that cardarine does wonderfull things for your cardiovascular system.