That is an incredible story. Not too long at all. This could be of vital interest to many people. I hope all the pingees I just pingified see it.
Any dentists who give patients laughing gas, I think it’s called nitrous oxide, should warn them about this. In fact, sounds as though patients should be monitored when they come out of it and if they exhibit those symptoms, should be administered sublingual Vit B (which I never even heard of, I suppose drops to go under the tongue).
People with dementia problems or relatives should try adding more Vit B.
The one I have, s.B-12 is a pill you put under your tongue until it dissolves.