| It's too soon! Period.
When you come back from an injury, there is always a nagging doubt about re-injuring it, if it's really ok. That's normal. You'll have to get over that at some point, if you do want to play. But you just got hurt last week and they can't even tell if the ACL is damaged. Right now, this is not the "will I re-injure myself on a healed area of prior injury" question.
It's also too soon to decide if it's time to give up racquetball for good. Let yourself HEAL from the injury, keep rehabbing it doing stuff that doesn't stress the injury (swimming and whatnot), and once it's better, then you can stop and think about how much you missed racquetball during your recovery period and what your life would be like without it... | 
