I understand your frustration, but I have been down that path and getting an test doesn't tell you that much. It improves what you know (I know I have HHV-6, probably active EBV and probably active VZV), but it doesn't pave the way to treatment.
Firstly, the connection from ME/CFS to Herpes-Viruses is weak (and everybody in the population has one or another Herpes-Viruses).
Secondly, testing is complicated. There are 8 known Herpes-Viruses, so you probably need to test for all. For every Herpes-Virus there are different "sub-tests" one can do to determine whether a certain virus is present or not, and if present if it is dormant or active. Not every lab offers every test. Different doctors interpret the result differently. So after a test, you could be none the wiser...
Thirdly, there are anti-virals for Herpes, but results are not that good. Professor Montoya from Stanford had some success in a small study with patients who had high "titers" (a measure of the test), but in a bigger study it didn't pan out that good. I would guess less then 10% of ME/CFS patients are helped by Anti-Herpes anti-virals, the anti-virals aren't cheap and the side-effects can be not so nice (e.g. kidney problems). So finding a doctor that will prescribe anti-virals is the problem. From my experience simply waiving a test under the nose of the doctor isn't enough to convince him/her and he/she would be right not to prescribe a drug he/she is uncomfortable with! The evidence just isn't that good.
And fourthly as hinted above, even if you test highly positive with the current tests, and even if you find a doctor that prescribes currently available anti-virals and you try them for a year, you have a very high chance that it would not help you.
If you got specific Herpes problems (as in Shingles) in addition to ME/CFS, than I would suggest you try to press on based on that. If you "only" (sorry, don't know how to better word it) have ME/CFS, than I would not get too hung up on that at that moment.
There is some research going on with regards to Herpes viruses and ME/CFS if there are any developments you will hear them here I guess. At moment you are certainly not missing out on a magic bullet by not being tested and it won't help you with your doctor if he isn't convinced.
The problem is not that patients are denied the test, the problem is that there is not enough research being done.