You share a number of features with me of a off (in my case hypothyroidism) thyroid level. Even if you have had that checked say two years ago, it can change within that time frame as it did with me (A thorough thyroid check entails a number of labs, so it behooves anyone to read up on it). I have read repeatedly that one autoimmune disease makes one more susceptible to others unfortunately. What I have learned on my own health journey is that people with hypothyroidism often have low stomach acid levels and the symptoms of low and high acid levels are said to present similarly. I have personally found it takes patience and reading and/or the good fortune of having a gifted healthcare provider to sort matters out. I found some replies to the recent post on this site "Anyone else gone gluten and dairy free to help improve symptoms" by eileenb1022 quite interesting. I wish I could be of more help to you, I am no stranger to the frustrations.

Do you have vision issues such as everything having a yellowish hue or like a film is cover your pupil that you can't wipe away, decreased night vision and total vision decreasing?
The cognitive changes, can't concentrate, retain info brain fog, out of blue struggle w problem solving or crisis management/decision making difficulties, feel dumbed down?
Extreme fatigue all the time, are your stools, smelly and orange in color or yellow?
If so, I have been diagnosis with malnutrition with malabsorption. And could probably email message with you why and how it started for me, who diagnosed it, how it was diagnosed and what treatment I've tried, if you're interested, feel free to message me anytime. I feel your pain, it controls every working system, all the way to consuming symptoms and silent suffering.