This is a further explanation for your hair loss diagnosis.

http://www.webmd.com/skin-problems-a...oss/effluviums

Have you had that carotid artery fixed? This could be the source of your attacks. There is an internal and external carotid branch.

These are various images:
https://www.google.com/search?q=exte...iw=981&bih=662

This path is very close to the trigeminal nerves as well.

You are young to have a completely blocked carotid. Is this the side of your head that you hit when you had your bike accident?

If your pain is ischemic (blocked blood flow)...then using ice would not be a good idea.
I wish you had told me this in the beginning. I'd stop the ice for now....and just do the magnesium and the lidocaine.

What supplement did you buy? I hope it is not Oxide form. That does not get absorbed from the GI tract.
SlowMag would be best for and easiest for you. It is available at WalMart for a reasonable price.

This is their website:
http://www.slowmag.com/

If you read that website it will explain why some magnesium oral supplements do not get absorbed as well as others.

If you get injections IV of mag, do stop your oral versions.
The RDA for adults is around 380mg a day, elemental.

Here is my magnesium thread.... this is a very important subject and most Americans are low in this mineral.
http://neurotalk.psychcentral.com/thread1138.html

Magnesium is used for certain vascular headaches in some people. But it really needs to be a daily intake, and not pulsed with megadosing IV only. So please read my thread to learn how to provide it for yourself eventually.

And stop the ice for now... you have a vascular issue... which is irritating the nerves. That is more complex than just nerve damage.

And please do continue here so we can all see how you are doing.
It is difficult on readers of forums, when people just leave ...it is much better all around to provide some updates, because people who come to the internet tend to be helper types....