does this mean you use caffeine on and off? do you get withdrawl when you quit it?
Yes to both. Yes I get withdrawal but it's worth it to me to have a few worse "bad" days here in there in exchange for better "good" days. Typically it loses its effect after 2-4 weeks and I'll take a break and start it again.
Note that now that my overall ME/CFS condition is more severe it is harder to deal with the withdrawals so I have to taper off much more slowly than before.