Thanks everyone. I'm absolutely thrilled. I thought he was feeling fine before, because he was still eating and drinking and playing but he has been a little DEVIL today - so I know he definitely wasn't feeling 100% before but now is.

He's got Samantha chasing him all over the house. Earlier today, he stalked her tail and attacked, instigating a chase. He and Sushi have been beating the hell out of each other all day. I can't tell you how relieved I am to see my boy acting so different. *sigh*

Now I just hope he starts to settle down... it's 11:30pm and my bedtime!