Hi , I m 54 years old and this week I m on vacation with my husband and for the first time in my life for 3 days in a row while having sex almost teaching an orgasm I got very bad headaches starting in the back of my head. The first time it lasted for hours . The second time I was aware of it and was not as bad , took advise both times afterwords. The third time when I was close to an orgasm I started to get the pain in the back of my head , got scared and stopped. It this normal?