Hello,
Sorry to hear you are going through this too! I was taking 250 mg of magnesium citrate and it got better for a couple of days but I went off of it for a day because it upset my stomach and now my thumping has been back for a couple of days making me crazy and anxious too. I am planning on taking a different type of magnesium which is easier on the stomach. Mine is during the day and doesn’t do it much at night. Four years ago I had this and it would be at night only and I was unable to sleep. One night I layed down on my hand with my palm facing up and applied a lot of pressure and the thumping slowly died down after some time so you might want to try that at night. Not too much longer after that it did go away completely for a few years and now is back. I’m hoping yours and mine and everyone else’s will just go away in it’s own. My doctor did say anxiety and lack of sleep can cause it but it’s so hard when the thumping is causing the anxiety and lack of sleep! Best wishes!