I had a microdisectomy exaxcly two weeks ago. Although I didn't have a head ache, I did have bad chest pain, I couldn't clear the chest congestion. It slowly cleared and now it is almost back to normal. it seems that everyone reacts differently to the anestesia. I drank a lot of liquids (mostly water) to help flush my system. I also ate bananas for the potasium to help with muscle cramps. I chose not to take any pain meds after surgery, only an aspirin in the moriing and one in the afternoon.
Your problem may be due to the stress and anxiety of the ordeal. At any rate, you should call your doctor to set your mind at ease.
Russ