Hello~I hope that by now the issue has cleared up.
As far as too much radiation from an MRI, that is not true. Because radiation is not used, there is no risk of exposure to radiation during an MRI procedure.
If you are still having issues, I suggest maybe seeing a chiropractor as you may have some pinched nerves in your neck causing the trouble. He/she will take some x-rays, discus them with you and make a treatment plan for you, after a few adjustments, if this is what is causing the trouble, you should start to feel better quickly.
Glad you saw your doctor. That's important. So, what about this . . . trying to understand what you are describing. But, we have all sorts of attached and interacting musculature on our skull. If one area is tight, it can cause a pulling, pinging sensation. ? Or what about migraines, headaches in general? Does anything relieve this like ibuprofen?
What is your fear in terms of what is going on?
I've had inner ear issues. For me, they almost always come with dizziness. Also that sense of fullness and a bit of hearing loss. Is that what you are having too? Or what you had in Asia making you go to the doctor?