well, when i first started menopause i had face hot flashes. is it actually hot to others or just to you? doesn't sound fibroish but i could be wrong. suggest you speak to your doctor about it. if you have a gyn go there first. giggle. don't know your age and you are not to tell me here so if you are over 40 it may be hormonal.
Whiplash will cause that especially if your neck snapped during the wreck...( Not an actual audible snap) like a bull whip snap feeling....Your neck vertebra are most likely out of alignment...Have you noticed any numbness or problems focusing your eyes, even for a short amount of time? A great place to start would be a chiropractor, they deal with accident victims alot, unless you are already under a doctors care... Even then it wouldn't hurt to add a chiropractor to your team...Usually chiropractors can do decompression therapy to your neck and have you feeling better in 2-4 months...
I have the flushed face as well, and I have also suffered from whiplash. I have never heard of a connection until I read lehcarwoman's post. It would be interesting to hear if you have had whiplash as well.