Strange 1 side zap pain. Significantly!

Hi All, I have been experiencing a very strange kind of pain on the upper left side of my head, just above the ear. It started about 4 days ago. The pain was quite intense during the first two days, and since then it has changed into a radiating, throbbing, or “zap-like” pain that comes and goes. Two days ago, I woke up around 5:00 AM because of neck pain along with pain in that area of my head. However, I was able to go back to sleep later without any issues. Unfortunately, I searched Google and read that headaches that wake you up from sleep can be a sign of a brain tumor, which has made me extremely anxious. This morning, I also experienced some dizziness, although I’m not sure whether it was due to stress and fear or something else. The throbbing/zap-like pain continues to come and go. I have tried taking a vitamin B12 tablet and a painkiller, but I haven’t noticed much relief. Attached picture I have a history of health anxiety (hypochondria), so this has significantly