I've never taken Risperdol, but an anti-psychotic and an ssri is not uncommon as a combo.
One thing: Uni Girl, you mentioned somewhere in another thread that you're having neck and jaw tension. If you really don't think this is anxiety based, if it was ME, I would tell the doctor. Sometimes anti-pscyhotics, even these newer ones, can have side effects that can even permanently damage facial muscles.
The doctor should also have offered you another drug called Cogentin to take along with the Risper. It counteracts these side effects and prevents damage of muscle tissues. Your doc may say "oh, no, that's only for the older anti-psychotics" but that wouldn't satisfy me. I think ANY med that acts on dopamine (as all anti-psychotics do) can potentially create these effects.
At any rate, tell the doc. She should know.