I Am 60 Year Old Women In Good Health. The

I am 60 year old women in good health. The only thing that I have and lately is a root canal after returning from our trip to Jamaica. I was on Motrin prescription strength for about 10 days. I woke up the other day and had my first headache after relations with my husband and then again when my heartbeat raised in the gym. It is mostly on the left side head but on the forehead and eyes also. I have read many other people having similar problems but with no answer. The sudden on set made me think it could be in my neck or a nerve but I do not know. What do you think?