I’m am on the same tracks you are, trying to find out WHY I get this. My theory is gut flora, since it many times comes down to what I eat regarding probiotics ore foods that also kills micro-organisms besides yeast.
Regarding your thyroid: C. albicans mostly cause hypothyroidism, my mother from whom I assume I enharited an overgrowth of C. ablicans from, took thyroid boosting pills/replacement drugs for many years. Not because her thyroid was measured low, more because she had the symptoms and they went away by taking this medicine. Iodine does the same job.