I was diagnosed with a variety of tests (over many months) - blood, vision, hearing and several MRIs with and without contrast.
Because my first symptom was only vertigo, I was initially diagnosed with Meniere's Disease. It was only when I began to have other problems (I kept feeling as if I were wearing very heavy winter gloves) that the ENT recanted the diagnosis and sent me off to a neurologist.
I've never had an LP as the MRI results were positive.
I wish you well and that you'll get an answer soon.
Niko