I'm new here, and desperate, so jumping right into things. I might be new here, but I am several years into trying to diagnose this. Because I thought ME/CFS was "Long Covid" I ignored it for a long time, because I had avoided COVID the entire pandemic. Now that we're realizing Long COVID is just ME/CFS, it caused me to look this way. I wish I had done this years ago.
A few things that jumped out at me about this Thiamine deficiency thing:
caffeine neutralizes thiamine
high carb diets need more thiamine
the list of high thiamine foods are a who's who of things I don't eat
I don't eat pork, I don't eat seafood, I don't eat any of the vegetables that have it, except Asparagus maybe once or twice a year. I looked at the bread I've been eating for a couple years, and it doesn't have thiamine enriched in it. It made me start wondering, what if society has just shifted off of some foods we used to get thiamine from, and now a subset of us are in this hole? I will drink upwards of 4-5 12 oz sodas a day, all with caffeine, well, I was. I also basically only ate carbs. When things would get bad, I think I was actually cutting out my only thiamine sources, because I thought this was SIBO.
So with the knowledge of all that, and the fact that I've gone down many other paths (tick borne illnesses including Alpha gal, other deficiencies, thought my PPH was progressing to heart failure, etc). The fact that I have PPH and a thiamine deficiency leads to congestive heart failure is also a crazy sign. So, I asked my PCP for the B1 test, TDP I think, and did that yesterday. I then went to CVS, got magnesium and B Complex. I've been eating a little bit of thiamine with each meal, and taken the vitamins twice now. I'm already seeing benefits. It could be that I am coming off of a PEM or something, so I am not overly hopeful, but I also know my body quite well after years of suffering. I even had this weird thing where my feet were causing problems that seem somewhat unique to me, and that has gotten better in 24 hours. Tachycardia seems better, not getting so out of breath, I feel groggy after waking up as if I actually got rest.
Anyhow, fingers crossed. Blood work takes 5-7 days, lower than 70 is abnormal. I told my wife, my guess is 12, just for no reason but a guess.