As the previous reply says, it could be any number of different infections and potentially that could've triggered the neurological disease ME/CFS. There is no reason to think it's XMRV as the evidence suggests that XMRV is not capable of causing a pathological infection in humans. Also, when scientists injected rhesus macaque monkeys with huge amounts of XMRV and observed them for many months after, none exhibited any symptoms.
Have you seen a neurologist or immunologist? Some of your symptoms are consistent with ME/CFS, but also other conditions like multiple sclerosis. You really should push for a specialist opinion.
There are no symptoms that have been shown to be associated with XMRV, nor has it been shown that anybody is actively infected with this virus, that was accidentally created in a lab during the creation of a prostate cancer cell line in the 1990s and has been shown to have contaminated samples and cell lines in some labs.