Hi @afrobin yes it is a lot, right? You have a good point, doctors are not pharmacists...
I checked your link as well. The 'fluttering' is exactly what I experienced, and the pumping sensation drove me nuts. I am so glad with this link and the other links. I find it incredible that my internist didn't know about this.
I called the cardiologist (who is usually not very responsive and hardly answers any questions) but he wasn't in, they created a phone appointment so he will call me tomorrow afternoon. I am still not feeling okay, I was pretty vague on the phone earlier today. So I hope my body can flush the magnesium and I hope I will get back to normal, I am a bit concerned 🙁