Have sinus pressure & post nasal drip w/ no runny nose. Hands are shaky and ears are ringing, had eyes checked, all good. Afraid of brain tumor.?

Probably not! At 20 yo your symptoms point more towards a basic sinus issue, with a possible underlying anxiety disorder. If your hand shake all the time, you may have some familial tremor or something else, but most likely not a brain tumor. If the shaking is constant, than see a neurologist to get it evaluated. Best wishes.
Probably not a tumor. Things like sinus infection is a lot more likely than a tumor as an explanation for your symptoms. See if your doctor can see you today to check this out for you. .