Waiting is not easy, but it's OK, because these tumors are never really an emergency. Once I was worried about a tumor, I became so hyper-sensitive to every little thing and my mind would assume the worst. The MRI will tell all, and I would suggest to just do your best to relax and put it out of your mind until you know something definitive. Tinnitus and hearing loss can happen for all sorts of reasons, so its no need to worry about the worst case scenario. But, I know this is easier said than done!
I wish you peace.