When I had my concussion I experienced poor ability to regulate temperature for 24 - 48 hours afterwards. I felt hot one minute and cold the next. Temperature regulation is done by the brain so this is not surprising. However, this was the whole body, quite different from just the head sweating.

So, it sounds like your head sweating might be due to something completely different. I haven't heard anyone mention it in relation to PCS.

I think that you are wise in that you intend to discuss it with your doctor. Let us know how you get on.

Good luck.