Sorry to hear about your symptoms. I can understand your concerns about the possibility of a brain tumor. There are certainly some types of tumors that can affect your hearing such as what;s called an acoustic neuroma which is slow-growing. These are usually benign tumors that can be curatively resected by a neurosurgeon. But this can also represent chronic hearing loss, primary ear problems, hearing nerve problems, or an abnormal artery that sits against the hearing nerve. Drugs such as the antibiotic gentamycin and some sulfa drugs such as lasix can cause hearing loss and ringing. Trauma can cause these symptoms, too.
Glad the eyes look ok. It does sound like you have floaters, but keep in mind that I have not personally examined you. Floaters and blood shot eyes are NOT typical presenting symptoms of a brain tumor. What is more indicative of a brain tumor is swelling of the optic discs within your eye (which the eye doctor should have seen), weakness/sensation or speech changes, blurry/double vision, and headaches. MS is also a possibility, but the eye doctor should also have seen evidence of an optic neuritis. Sounds like you've seen a ll the right docs. If you really can't wait until your MRI, consider seeing a neurologist for a formal exam and possibly peace of mind if it comes out normal. Best of luck.