Oh Sarah how horrible

I can only assume you were hopeful that the physio would help and it must be crushing that it didn't. I have just started vestibular therapy (9 days now) and I haven't had any bad moments like yours. I thought I was going to vomit a few times but I didn't. I also do not have any dizziness unless I'm moving. Mine is more of a disequilibrium which I believe to largely be because of my eyes.
I'm sorry but I don't remember if you've seen an ENT? It sounds like your kind of dizziness might be something they could help with? I don't know if this will make you feel any better but... from what I've read... dizziness is a symptom that usually indicates a longer recovery time.. the reason I'm saying this is because I don't want you to think you aren't going to get any better, it's just going to take a little longer unfortunately. I'm in the same boat but I'm trying to be patient and optimistic. (neither which come naturally to me!)
Again, not sure if this will make you feel better or not, my physiotherapist said, after a little prodding, that this type of treatment is not successful very often. It's worth a shot and you'll know by 6-8 weeks if it's working or not but the success rate is not very high. I decided I had nothing better to do for 6-8 weeks

so might as well give it a shot but I'm not getting my hopes up.
Have you been able to quiet your life down some? I can't see how you'll ever recover if you keep going the way you are. I hope you're feeling better now from your physio. I just finished mine and everything's moving! Time to go meditate.
Have faith that you WILL feel better in time.
CC