I personally used to often feel cold five years ago but solved the issue for myself. There are days where something emotional is going on and my thermoregulation is messed up but that's not my default.

Another thing that I believe but which does not come from an academic source is that the problem is likely emotional in origin. I consider it to be a self defense mechanism of the body. If they get removed I consider it likely that emotions will come up and that have to be dealt with. Based on what you wrote about severe trauma, I would recommend you to have professional help.

The link between emotions and blood pressure as well as thermoregulation you describe sounds a lot like vasovagal response

In that case I doubt that is what I'm experiencing, since I haven't noticed ANY correlation between my day-to-day emotional state, and how hot or cold I'm feeling.

So unless there's a possibility of very long-term correlations, on the scale of months/years (which doesn't seem to be what you're describing), I doubt this particular mechanism is causing my cold sensitivity.

I am receiving therapy. Thanks for the suggestion.