My only real experience with Risperidone is that of exaggerated anxiety. For me, it had the almost immediate effect of making me unduly anxious about things; about everything, without the presence of any triggers or stressors. It didn't cause the tiredness and lethargy but that may be because I didn't remain on it for long enough to notice. Same with the depression you spoke of; it may be that this would have developed over time, had I remained on it.
Because of the extreme anxiety it introduced my psychiatrist discontinued it very quickly; far more quickly than would have otherwise been recommended. He replaced it with Olanzapine. Olanzapine had the same effect on me after a while as Risperidone had on you ... it took away my motivation so that all I wanted to do was vegetate. All the running that I did before hand just fell to the wayside and I stopped boxing and kickboxing altogether.
Sorry I can't be of more help Coast2. The best one for me personally has been the one I've just started again; Aripiprazole. We're all different of course.
Here's hoping you get settled soon and that your motivation and enthusiasm come back again. I'm sure they will in time