I have a 2 yr male cat. Today, he was walking down the hallway, then started crying out, back leg was drawing up. He was turning his head over his shoulder. Rubbing his head on the ground. Crying out the whole time. This lasted about a minute. I know this is hard to explain. He has done this 3-4 times in the past 2-3 months. Never as bad as it was today. He is fine now. Any suggestions?