Hi, Cassi ~
The unknown can be scary so I can understand why you're anxious. I think pushing up the MRI scan is probably in your best interest, if the doctor agrees.
We're basically an online, peer-to-peer AN support group and cannot offer any substantive feedback that might help you determine what is causing your symptoms...only trained medical professionals - doctors - can do that, which is why an updated MRI may be helpful. However, should the MRI indicate that you have an acoustic neuroma (or a similar type of tumor), we're here to offer information, practical advice and support.
I truly hope that you can find permanent relief for your symptoms soon and if it turns out that you have an acoustic neuroma, I'm confident that the treatment won't be as daunting as you may imagine. Meanwhile, consider contacting your doctor to request pushing up the date for the planned MRI scan.