I've been on thyroid medication, Levothyroxine, since 2015. I tried the natural version but never noticed anything and it didn't change my thyroid test numbers, so we stuck with Levo. However, over the years my thyroid continued to slowly decline in function, causing us to slow increase the Levo dose.
Interestingly, as the hypothyroidism increased, the ME/CFS symptoms increased. Other comorbidities developed along the way as well, like Hashimoto's, neurotransmitter dysfunction, dysautonomia/PoTS, and others.
Last year we finally figured out that every autumn my thyroid crashes, thyroid antibodies flare up, and all my conditions drastically worsen until a slow improvement come May... which is when spring typically arrives here in the northern New England Mountains.
After my full thyroid panel tests came in last October, and were quite bad, my dose of Levothyroxine was boosted at the start of November from 75 mcg to 100 mcg. I was also put on 25 mcg of Cytomel at the same time, which is an active form of T3 and more potent than Levo. Also, I was started on MedCaps T3, all because my hypothyroidism and Hashimoto's grew far worse than it had been. It took a few months, but recently I've been noticing a marked increase in overall energy and a decrease in levels of and amounts of PEM crashes. For the past 5 winters I've been house bound 95% of the time from November through April, and bedbound about 75% of that time. This winter, so far, I've only had to spend the whole day in bed 5 times. I've been able to make it out onto the back deck to sit in a chair about twice per week. I've also been able to sit upright in a chair inside for an average of 3 hours at a time with 2 hours reclining between. My PEM crashes are about 70% less severe and only last 2-3 days as opposed to the normal 7-14 days. For the past three years my need for supplemental O2, especially in autumn and winter, has gone from daily to maybe once per week starting in January this year.
There are some real shifts happening, and the only major things we changed was the thyroid medications and supportive supplements.
I have moved to taking all of the above, but leapfrogging the Levo dose to 75 mcg one day and 100 mcg the next. My recent TSH number was very low, but my T4 number was also very low. The T3 and Free T3 were looking good though. So, my doc wants to keep me on this regime for now and test again in May. My guess is we will drop the dose again for the warm season and then probably increase it once autumn returns. The severe thyroid drop in autumn and winter is a pattern with me.