So things are finally starting to make sense thanks to Dr Flanagan.
I had my own horse for years and rode. Have been bucked off, fallen from, horse tripped and somersaulted once and semi landed on me, broke rib, elbow and 3 metatarsals on 3 separate times...
I am never cold. Just the opposite. My head and neck are so overheated. I can take a gel cold pack from the freezer and stick it directly on my skin on the chest and I do not jump. It does not bother me at all. Feels good. I feel I am running a fever all the time. My face is always flushed.

Dr Flanagan wrote back to me.
The cause your temperature dysregulation is most likely due to pressure in the third ventricle. My next website page will cover more on the critical structures that make up the third ventricle. Among other things, the third ventricle plays an important role in thermoregulation. I looked into the role of the hypothalamus in thermoregulation, torpor and hibernation decades ago. The cavernous and suboccipital cavernous sinus are also important to the counter-current cooling mechanism of the brain. Venous back pressure and inversion flows in the sinuses can decrease the effectiveness of the cooling system of the brain.
http://www.upright-health.com/third-ventricle.htmll