What Is This? ?

So yesterday I had a pop in my head. For the past three months I've had a tight pressure mainly in my forehead. Now it's gone...and I feel strange? Like I feel really faint in my head and kinda dizzy. After the pop i felt really weird, my heart was racing, felt like I was definitely gonna pass out. I went to the hospital and had a CT scan and everything. Everything looks fine. I can't tell if this is all psychosomatic or not. I did notice before when I would bite down on my teeth the sound of it sounded like it was inside my ears. Now it sounds normal again? Could it have been an ear issue? 

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