Diagnosed with TMJ but I am convinced it's a brain tumor

Recently I was diagnosed with TMJ, but my symptoms have recently gotten so severe and debilitating, I am convinced it is a brain tumor. I was hoping to see if TMJ sufferers have similar symptoms as I do because mine seem to go beyond the most commonly mentioned TMJ symptoms. My symptoms include:

Most Debilitating:
- Severe heading on the right side of my head around my temple region
- Dizziness
- Nausea
* These symptoms seem to be most severe in the morning and afternoon and then decrease in severity by the evening.

Bothersome symptoms:
- Right ear fullness/stuffiness
- Pressure behind the right eye
- Mental confusion or brain fog
- Popping of my jaw on the right side

I almost headed to the ER this morning because I was feeling so horrible and was convinced I had a brain tumor. I talked myself off the ledge and didn't go, but I am still very worried. I have two young children and have always been a very fit and active person, so I just hate not feeling like myself and am so scared that something life-threatening is wrong with me. I guess I am just looking for some feedback from other TMJ sufferers. I am wondering if I should push the issue and get a CT or MRI to rule out the brain tumor or just pursue treatment for TMJ to see if it works. I have been wearing a bite guard (purchased at Walgreens) at night per the advice of the ENT who diagnosed me, but not doing anything else for treatment yet. Thanks for the feedback!