I too am starting Aimovig in a few weeks, (waiting on approval) and hope it really helps in preventing these migraine attacks, even if just easing them ever so slightly. Wishing you the best on Aimovig.
Ectopic beats can be nerve-wracking when dealing with them, but I find over time I've come to breathe through the episode and it calms it so much faster than when I would panic. Stress definitely causes so many different ill effects on the body, such as worsening migraines, gastro issues, numbness, etc. - it can all be frightening.
I definitely have an over-sensitized neurologic system making me quite aware of my racing heartbeats on several occasions, not just with migraines. Stressful situations are definitely a trigger for me both migraine-wise and stress-wise.
Hoping Aimovig is a positive experience, you manage migraines well enough, and that stress is low this season and throughout the next. Warmly Rebecca