Yes, it will get worse.
Look into DHEA and Propionyl-L-Carnitine...as well as keeping carb intake high.
I suspect a lot of the lethargy has to do with greater efficiency of fatty acid release, with insufficient cofactors for proper transport into mitochondria.
I just ran an experiment on a tester that was stacking 1-AD and Havoc, experiencing MASSIVE lethargy, and the PLCAR completely eliminated it.