Thank you for your input... SO much! When you say "Don't over extend yourself."...is 5 minutes of mild exercise a day ok? And is there a particular brand of Vit B3 that you preferred? I always go with brands that are third party tested for an unbiased review. I already have been on a low histamine diet for 7 months now and have not had much, if any improvements. My Tryptase blood levels keep going up despite that low histamine diet which shows that my mast cells are giving off too much histamine. So I get tremors and heart palpitations from it and zaps down my legs and muscle twitches. I am also being ruled out for Lyme disease although I don't ever recall a tick bite. But it seems Lyme disease can stay dormant in you as long as your immune system is in check but once getting covid some immune systems can't deal with the covid AND the Lyme so it goes after what virus is strongest thus causing the Lyme disease to come out of its dormancy. Seems many, many people have Lyme disease and don't even know it. Lyme testing is difficult and most conventional doctors are not familiar with the extensive testing involved. They order one simple blood test and think that if its negative, your fine but that is definitely not the case. There is so much more testing like Western Blot tests and the like that should be done and even then if you are not dealing with a Lyme literate provider then you can get the brush off.
In any event, I am waiting for my Lyme disease test results from an independent lab that came highly recommended from Lyme disease folks and also will need a bone marrow biopsy to see if I am dealing with systemic Masto cytosis post covid per the Immunologist and Hematologists recommendations.

I will definitely try the B3 supplements and have restarted my liquid IV packets again. Thank you so much for your very valuable input. God Bless you and stay healthy. Waiting for my day to turn a better corner.