@EKF that was a brilliant post.
A lot of the symptoms you’ve described are present in me, I was taking an iron supplement since I’m a weird hippie vegetableist but take them first thing with breakfast and plenty of black coffee (I work in IT and the whole IT world is powered by coffee).
I’m going to amend when I take them now. Didn’t know about it b12 affecting red blood cells which I know I am low in because without supplementing b12 I get horrific ulcers, so that’s the encouragement to remember to take them too!
Big thanks and I hope it helps me.