Ugh I know EXACTLY what you mean...the fatigue is the worst symptom for me. For the past 6 months on a lot of days I havn't been able to do anything much other than the absolute necessary (work etc). I have to plan my weeks out so that I don't end up doing too much on one day, and try to keep my days off work as free as possible. Maybe thats something you could try?! Its a complete pain to have to do, but it helps in the long run, otherwise you might end up getting even more tired by doing too much in one go.
I also take Zopiclone when I'm having a bad bout of sleeping (seems to be when I'm on a higher dose of Pred).