| Hi Colleen! I know how frustrated you feel. Unfortunately, with the vet, if he didn't do any fecal tests, or wasn't looking for worms specifically, while working on the urinary problems, it is something that he cannot be held accountable for.
It is so hard to figure out where our animals pick this stuff up. Do you live in a milder climate? Are your cats allowed to wander outdoors? Is it possible that even one of them had contact with any other cats or animals? It is highly unlikely your cat picked it up at the vets unless you took one of them there more than a week or two ago for medical treatment.
Sometimes if you have had a previous problem with fleas in the house, even though you think you have killed them all, eggs might have been laid in between floorboards and such. I was told once by a vet that these eggs can take up to 2 years to hatch! I never went out of my way to do a fact check on that.
Yes, you can easily buy over the counter meds to help get rid of the fleas. There are many to choose from. Since you want to tackle this problem quickly, go to your local pet store and ask one of the clerks to show you all the products they have and which one seems to be the one that most cat owners prefer. You will need to purchase as much as is needed to treat all three cats. You may also want to pick up a preventative such as an externally used tick/flea treatment for cats and use it to kill any possible fleas that may have wound up in your home, and to give them additional protection from picking up fleas outside and bringing them back in again.
Just as an added measure, if your cats suffers from UTIs frequently, you might want to look into buying 100% dust free litter. For males, UTI is a problem that occurs more frequently than in females and quite frequently you can resolve it by using the dust free litter.
Hope this helped! Good Luck! | 
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