Vestibular ataxia

have 2 year old male with FHV. Yesterday he began acting strange like missing a jump onto the counter and acting more lethargic. Today he just walked past me and was falling to the side and bobbing his head. He has nystagmus, right sided head tilting, and is falling to the right side. The only vet open is an emergency vet and I worry about not being able to afford this visit.

I have a background in medicine and the gradual onset makes me feel he has a right sided vestibular ataxia due to either infection or other idiopathic cause. I’m assuming waiting til Monday for treatment won’t be detrimental but wanted input from this community.

I’m aware it could be potentially more serious etiologies like a stroke but he’s young and it was an insidious onset.