Maybe he would of requested more tests when you went again. Ive found that many CFS specialists run any tests they view as upmost importance on the first visit but then often follow these up with other tests on future visits. The whole thing can be a process.
He did do a tilt table test but told me what he saw he had actually never seen, very rare, and that I certainly have dysautonomia but he didn't know what. So that wasn't treated either. I had to go to a dysautonomia specialist he looked at the results and knew immediately I had: hyperadrenic pots . It's different from regular POTS, I have tachycardia all the time, even when lying down.