Mastic Gum temporarily ended my CFS, why would it stop working?

Used mastic gum for about a week and it worked wonders for me but then it just straight cut out and won't help me at all anymore. It's strange, NAC did the same exact thing for me, I felt so much better during the first week or few of using it that I was almost euphoric then it cut out and won't do anything even now, neither of them will. Whats with that? Tweet