I had full tonsillectomy, in the hope my fatigue was rooted in a difficult to diagnose sleep disorder eg sleep apnea or Upper airway resistance syndrome (a similar condition). Really, in hindsight, I was grasping at straws hoping *something* would help the crushing fatigue.
My testing of EBV titres were also very high, indicating EBV as a cause for my fatigue.
The tonsillectomy did nothing to help, at all. My EBV titres remained elevated, fatigue remained constant, and I actually did not have a sleep disorder to resolve in the first place. The only benefit was reduced snoring (which wasn't that bad to start with).
My take is CFS patients are better off to keep surgical procedures off the table in attempts at resolution of CFS.
Now, if you have diagnosed sleep disorder that a tonsillectomy is known to help, and you're thinking that just maybe it might have some effect on your fatigue, your in a good place to proceed with the surgery. But keep your expectations low, because sleep disorder related fatigue is just peanuts compared to the fatigue CFS patients face - meaning that even if you resolved a serious sleep disorder, you're barely going to budge your fatigue levels as long as the cause is CFS.