Have you been putting up with this for the two years you've been on one of the meds or has it come on recently? Because if it's come on recently then it may not be to do with the medication. Fatigue can happen because of a large number of reasons.
I have had trouble with fatigue and lethargy on psych meds, Amisulpiride I think was one of them. The only real solution I found was to not take the medication anymore.
Caffeine may help.

xx