My left ear has felt odd for the past six months now. Its hard to describe the feeling but it just feels weird. Kind of full, crackly, pressured and so betimes I get sharp pain in it. When I swallow, I feel it in that ear. My doctor has looked at it numerous times and she tells me that its not infected but does have fluid in it. The fluid keeps coming back every time I sleep with my head positioned a certain way. Thing is that I have never had ear problems before. I do have TMJ.
Its obvious your ear is conflicting with your sinusitis. Ears are connected to our throats and noses, hence ENT specialists. So anything that is affecting your nose or throat, will affect your ear. Ear infections are hard to get rid and you might want to ask your doctor if he could change be your antibiotic so it goes directly into the ear, as in drops. Oral antibiotics have been known to not work very well in clearing up ear infections because very little of it actually reaches your ear after it goes all over your body.
I would nit be concerned about an ear infection reaching your brain. If your a healthy adult, the chances of that happening are 0 to 1. By the way, if the infection is that bad, you would be in a hospital by now. You just don't wake up one morning with an ear infection all the way in your brain. A lot of other stuff happens before it gets to that level. The only thing dangerous about ear infections is the potential of hearing loss in the very young. That's why you should always have a babies or child's ear infection looked at but as for an adult, only in a few rare cases does it need intervention, like if its making you dizzy, because it clears up on its own, its just very slow and persistent.
People over use antibiotics in this country. It seems like they want to give you an antibiotic for just about anything, even when its not necessary. Just remember to ask your doctor for the drops, not the oral one.