My inside cat, EVERY night sometimes twice a ngiht, He'll be just fine then all of a sudden He'll fall over screeching, just laying their flopping around screeching, I noticed while hes doing this he seems to be trying to reach for his back near the end of his tail? it'll go on for maybe 5-10 seconds then he just stops jumps up licks the spot he was reaching for, and then hes back to normal, walking around, playing, etc w/e he was doing in the first place. its been going on for awhile now, I called the vet but those dumb ***'s dont know anything, Never replys, and your lucky to ever be able to talk to the vet first hand. Anyone know what this could be? seen it before? He never did it as a kitten it started only a couple months ago, hes 1 year old. he doesnt seem sick either, perfectly healthy, active, shiny coat.