I get a tightening sensation around the sides of my head and neck when i masturbate, resist the urge to masturbate, or after i orgasm. i get stressed. my jaw and cheeks get tight. ive had multiple brain ct/mri return normal. should i be worried?

Stress: Given your thorough evaluation, you should be assured that you are not going to have some cerebral catastrophe. As such your headache seems to be related to stress and tension. Masturbation or sexual tension of some type seems to be the issue. Consider talking to a councilor? Check out the following thoughts on masturbation and this may give you some guidance. https://youtu.be/Kzy8yIu_vp0