Hi Worriedandconfused and welcome to this forum .....
You need to know that the people on this forum are not medically trained professionals. We do, however, have many collective experiences to share regarding our AN journeys.
You do not say what your signs and symptoms are right now that led to the diagnosis of vestibular neuritis. I suspect it was at least some balance issues.
Regarding MRIs and AN diagnosis: the really definitive way to diagnose an AN is with an MRI with contrast. Small ANs do not always show with CT scans or MRIs done without contrast. However, large ones will usually show at least as a shadow.
I can understand your angst/worry about the gadolinium dye. If you have multiple allergies to many things, it is worth discussing with your doctor. If you have poor kidney function, that is a concern with the dye, as well. In fact, most imaging centers require normal current kidney function studies, before administering the dye. In any event, you need to discuss your concerns with your doctor if you decide to go ahead with an MRI with contrast.
All that being said, an allergic reaction to gadolinium is considered rare if you have normal kidney function.
I have had numerous MRIs with contrast with no adverse reactions, but I have normal kidney function studies.
The decision whether to go forward with this is yours and yours alone. None of us can tell you if it is worth repeating or not.
Many thoughts and prayers for answers. Let us know what you decide to do and why. Thanks.
Clarice