It's funny how symptoms and responses are so different. The one thing that is absolutely guaranteed to give me symptoms is being cold. The thought of ice packs makes me cringe.

It's hard to describe, but when I'm cold, I get these isolated "rushes" in various parts of my body. It's that "chill up and down your spine" feeling when you see something scary or overly exciting, only these rushes are isolated to certain areas of my body e.g. from my left rib cage up to my armpit and down my left arm to my elbow. When I'm cold, they're near constant in that area.

I've Googled "cold intolerance neurological" so many times I've lost track. I keep thinking it has to be a clue as to what's wrong, but thus far, none of the causes I've found ring familiar with regard to other symptoms or test results.