I took my cats into the vet on Friday, they both received FVRCP, Feline Leukemia & Rabies. Both were droopy Friday & into Saturday with decreased appetites. Oliver seemed to make a turn around by Saturday evening, but Quincy is still not himself. He seemed more affected from the start, & his rear quarters were very painful, a gentle touch on his rear leg sent him running. He ate once on Saturday evening, & didn't even come to the bowl this morning. He doesn't seem painful today, but I'm concerned about the long term side effects with him. He is just over 18 months, so this is his second year receiving vaccines & I do remember last year was very similar, but I don't recall him experiencing pain last year. Should I be worried? Is there something that can be done so next year won't be so rough? I do have to vaccinate, I travel for my work & have to board the boys, they won't take them unless they are vaccinated.