Less stomach acid is actually bad if you have an infection because the acid itself kills a number of bacteria. Those who take PPI long-term risk having more bacteria in their stomach. PPIs also increase the risk of pneumonia. From Wiki article:
Also as I wrote earlier, the anti-inflammatory effects of PPIs have nothing to do with acid reduction (reference).
Oh, maybe it isn't an infection, but something else in the gut that responds to the PPI?
Interestingly, I get this same detox effect from other supplements, such as probiotics and glutathione, but also got a lot of negative effects from those as well.
CFS remains a puzzle, but the stomach is definitely involved heavily.