Diane,

I would not focus on the cause of the head ache. You have too many contributing factors to make a determination. I would suggest you just treat is as a head ache and try to go on. Even if it was caused by anesthesia, there is nothing you can do about it.

Have you tried icing your neck ? Heat is to promote blood flow. Icing is to reduce inflammation. I would think the latter is more important.

My best to you.