Essential tremors and post polio syndrome and agent orange exposure

Very rare condition, I cannot find any experts on this topic. The Veterans Administration admits that I was exposed to agent orange chemicals, thankful I never died from it or got cancer, however, the VA continually denies that my eventual permament essential tremors was NOT caused by the exposure. My attorney believes it was a matter of the Navy should never have allowed my enlistment because I was a polio victim at age 1, the recruiter said "well, you seem fine now". I would have been drafted into the Army and sent to Vietnam had I not joined the Navy, but it turned out I was sent to Vietnam on my ship that was transporting agent orange chemicals. I recovered mostly from polio but have forever had fatigue issues. Attorney believes the combination of having had polio plus exposure likely caused my tremors. I seek an expert's opinion that would agree that this is likely the case. VA denies me any benefits saying there is no proof or any experts saying it is likely. Does anyone know where I might be able to get such an expert opinion? THe Mayo Clinic is telling me they cannot make any appointments for any kind of exam even though I live 90 minutes away from Jacksonville. Any help would be appreciated.