Pooh Cat needs your purrs

When Socks came in last night he acted like he was really tired. This morning when we got up he stayed in bed, Hubby brought his bed in the house and he promptly went hid under eldest son's bed. When I tried to get him out he hissed at me (which is a first). I don't know what is wrong but he will be going to the vet as soon as she opens. He seemed to be walking oddly. It was hard to tell cause Princess Scylla kept trying to jump on him.