First of all, your husband is a lucky man....to have such a loving and caring wife !!
I am a wife and mother of 3 who was diagnosed with Chiari 8 yrs ago. I underwent decompression 7 yrs ago and was fairly stable for a few years. My symptoms have slowly crept back and am now in the process of reevaluation for the next step.
My suggestion for you is to visit the Wisconsin Chiari Center website.... http://www.wichiaricenter.org/
They will contact you by phone or email and likely ask you to send his recent films and medical history. I feel like the best hope for any possible reversal of symptoms would be with a Chiari Specialist !!

Good luck and God Bless !!
Melinda