Hi all! I am definitely no expert in vertigo but do know a bit about sensory dysfunction. I thought that might be the problem with my mom. She is 72 years old and developed vertigo to the point where she could not turn her head without experiencing extremely bad dizziness and vision blurring. Her PCP couldn't find anything wrong so she was referred to an ophthalmologist. They did multiple tests and could not find anything except that her eye muscles were weak and said she could have "special glasses" made to strengthen her eyes. They did say that at her age, it is normal for her eye muscles to weaken. However, for a reason I am not sure of, they requested that she visit her endocrine doctor (as she has hypothyroid) to rule anything else out. Turns out, she was low on Vitamin B12. The doctor gave her a shot and within a few minutes the vertigo was gone. She has a prescription for B12 and takes it daily. The vertigo is completely gone and she didn't have to get the glasses. I don't know if this is helpful but figured I would share.