So, as a brief background, I'm a 35 y/o female. Back in October I had the worst headache of my life as I was experiencing an orgasm. It spanned the whole back of my head, from ear to ear, so while it was scary, I didn't feel like it would warrant a trip to the ER. It lasted an entire evening, dulling only slightly as the night progressed, but returned in a more mild form the next day as I was bracing myself against the wind. I also had some pulsile tinnitis that was going through for several days after. I made an appointment with my primary care doctor about it, and I got an MRI at the end of December (delayed due to problems with scheduling).
The MRI came back clear, but over the past few days I've started experiencing a headache on a single spot on the back left portion of my head. It's mild, though occasionally gets up to a moderate intensity for a brief moment, comes and goes, but it's always that one spot. I can't figure out triggering events, as it always seems to occur at random moments. I've been having sinus issues, but this feels way too far back to be sinus. The only other innocuous thing I could think of is that it's somehow muscular, as my neck and left shoulder muscles have been incredibly tight in the past, and the headache hovers right at the top of where my neck muscles are attached to my skull (near my occipital lobe).
I don't want to go back to my doctor for something that's not "serious," and I definitely don't want to go to the ED unless I absolutely have to, and all Google searches do is make me anxious. Any insight would be greatly appreciated!