
you could put a little karvol drop on his bed to ease his congestion when he is sleeping, but the best treatment is if you can have someone hold him and you let him breath in steam if his nose is blocked, but be careful not to let him near the hot water.
You can also give him childrens benylin ...if you are not happy with him in any way go by your instincts and ring the vet.
HTH
Roni