I would suggest that you look back in to the thyroid/adrenal issues if I was you. Here is a link from a site that I have used quite a few times for myself, where I entered in the search terms "Heat intolerance". The first post is totally wrong - gluten intolerance - but the rest are speaking about
this exact thing. T4 supplements (Synthroid & others) usually don't help for long. Once I changed over to a homeopathic supplement for my thyroid (& my adrenals), I had quite a few improvements! There are prescript
ion thyroid meds that can do a much better job at regulating thyroid function too.
Oops!
here's that link;
www.stopthethyroidmadness.com/?s=heat+intolerance&search= I would encourage you to check out the entire site. It really has helped me to better understand what's happening with my thyroid and my adrenals - which helped me to get to a place where I wasn't suffering so much with those symptoms as well as the symptoms from my tick-borne infections.