Hi,
in my opinion, XMRV testing is still experimental at this point. We don't yet know what XMRV is and means. We also don't know what is the best test for it. I personally will wait until the science is better settled, before spending money on XMRV testing.
Regarding treatment, there are antiretroviral drugs which do have action against XMRV in test tubes, but they have not been trialed in live conditions under experimental design. Since XMRV does not replicate as often as HIV, we don't know whether medicines designed for HIV would work as well in real life (even if we had decided that XMRV was responsible for or contributed to our disease, which we don't at this point know). You would essentially be an experiment of one. I would not say this shouldn't be available, because patients who are very ill and have already tried everything else should have the right to try it. But I personally will wait for the science.
I would recommend testing for HHV-6, HHV-7, Mycoplasma, NK cell function, ANA. You might want to look at the Canadian and International Consensus Criteria to find more types of tests that might be useful.
willowj