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I have trouble going for the warm water explanation...

There are cautions for flying and diving, so there could be a relation there.

Is this considered a spinal injury (and if so, what vertebra are involved?) or brain related?

I assume MRI, CT, Ultrasound, Angiogram has been done? Results?

Noted.

Curious why no further testing.

Is the prognosis permanent?

Have you gotten second or third, fourth opinions?

One major rule: NEVER trust one opinion.

The work is on you to source other doctors and options.

Most doctors nowdays are overloaded with new information, and one likely knows something another won't.

http://www.proneuron.com/clinicalstudies/Q&A.html

http://www.themiamiproject.org/wp-content/uploads/2015/07/Experimental-Treatments-Booklet.pdf

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2678281/

Have you looked into any of the experimental therapies? i.e. stem cell?

There is a new drug being tested now that is showing great promise in regenerating, or stimulating specifically, damage nerves to repair/regenerate.