I do hope it is not a tumor, it is a pity you could not have completed the MRI! Having saiid that your tinnitus is almost certainly the result of a mucous buildup, probably from decongestants and or anti-biotics taken to relieve the sinus.

I would recommend that you order the sinus tinnitus remedy which is specifically formulated to thin down the mucous in the inner ear, thus allowing it to drain out through the Eustachian tubes.

Often the mucous in the inner ear becomes to thick to easliy drain out through the Eustachian tubes and the you get a pressure build up in the inner ear and this is what causes the infection, headaches, and tinnitus obviously.

You can get more product information here >> relieve sinus tinnitus