VA technically doesn't recognize a specific Gulf War "syndrome"- they follow guidelines within 38 USC 1117 to determine if the veteran has
a "qualifying chronic disability." and whether this disability was manifested within one year after service in the Gulf War.
"qualifying chronic disabilities" are explained in the regulation in this BVA decision:
http://www.va.gov/vetapp09/files1/0900076.txtThese types of claims trigger a Persian Gulf War Exam.
It is often much easier for a Gulf War veteran to show their disability is directly due to service then to fall into the requirements in 38 USC 1117.
BVA decisions -if you google Gulf War Syndrome at the BVA search feature ( at VA.gov under Board of Veterans Appeals )- show in detail what VA considers as Gulf War illnesses.
I assume your 60 was granted directly due to your service and not presumptive-
has the 60% gotten worse sonce that decision? Are you able to work?