Hi and welcome to the Chiari forum.
Many NS's will not admit if there is a problem with surgery they did, so u will have to go to a true chiari specialist to get the help u need...many NS's will not touch u as u already have had surgery...but a good chiari Dr will.
We do have a list of Drs names, u will need to research the drs, and find the best one for u.....not knowing where u live, I just want to say, u may have to travel so do check with ur ins as well-
http://www.medhelp.org/health_pages/Neurological%20Disorders/DOCTORS-LIST-FOR-CHIARI-SYRINGOMYELIA/show/1062?cid=186
In the meant time try to relax, I know it is not easy when u r having these issues....look at all the testing u had so far- did they rule out a syrinx, in the cervical spine, thoracic and lumbar?...tethered cord, sleep apnea, Ehlers-danlos, POTS, PTC....which I think u feel u have sine u believe u need a shunt....
May I ask y u had the 2 nd decompression?
"selma"