Hopefully for good now. He was trying to get out of the carrier in the car and meowed constantly all the way home. Huffed and chuffed once back in his room again, ran around and was a bit wound up and gave him some wet food to eat and played with him until he got too excited and started hissing and biting. I've checked him every few hours and left once he got too wound up again (got two punctures in my hand from one bite) but otherwise letting him try and return to normal. Sleeping will be a concern but it's part of his and my routine to let him sleep next to me at night which makes him feel safe.

Poor boy has a cold butt right now too, he's got that shaved monkey butt look because of his surgery to get the catheter into him. I'm sure he'll be very glad when it grows back and I'll be glad with everything finally back to normal.