thank you so much for your response, and I hope you find relief as well. if you're comfortable with it, if your cardiologist finds anything concrete out, could you post it here? I hope to find at least some direction in what this could be/what to explain to doctors.

Hi,
i just saw these posts. And i thought if i answer, it might help someone. I have SIBO and Leaky gut syndrome. And i had internat tremors and other horrible symptoms. The only thing that helped me was a diet with no gluten, no lactose, no sugar. Most of the time only vegetables and fruits. That was when my symptoms got less and less over time. I hope you got better since then though. Because of the leaky gut i had a sensitivity for gluten, lactose and sugar. That‘s why, after i ate these things, in the night i was getting those weird tremors. I also had tinnitus and brain fog, i felt anxiety and my muscles feld very stiff. The most horror thing was the asthma at night , i couln’d sleep because i wasn’t able to breath. I took some medication for asthma, but none made it go away. I tried everything, i went to a lot of doctors and no one could help me. Besides i am a doctor myself and i didn’t know what’s going on with me. I am really happy that i feel better now.

I have the same exact problem. It’s awful. Mine is mostly at night too. Did you find an answer to your problem?