Well, the vet bill was a lot since I had to get Summer 3 medicines, a bag of special food (not the kind Chevy got loose stools from), and two Feliway plug ins that will help calm them both down. One is in the bedroom, one is in the dining room by the garbage cans. It'll also help Summer not to be stressed out! I know it may have not been the cause (Chevy's stalking her to both litter boxes) but it doesn't help nor should it continue. Summer had both crystals AND bacteria, hence the food and extra meds. I don't know what to do anymore. Hopefully it all works out this time. She was a lot friendlier with them today I guess.