Welcome to MayoClinicConnect @saska . You’ve definitely picked the right discussion to follow. Everyone here is a volunteer so we help each other by sharing what has worked and what hasn’t on our health journeys. We’re not medical professionals so we can’t diagnose or prescribe.
Well ask members like @david1972 ans @jewles63 and @happyat76 and @champton to come back and maybe relate what they’ve learned.
In the meantime, read them this entire discussion. Maybe there is something to help. Have you asked your family members who had thyroid problems, if they ever experienced this shakiness?