My 8wo has a phlegmy sounding cough, is making lots of snuffling noises when he breathes, doesn't want to eat and is very grumpy - I can't put him down. But no fever. His sister is just getting over a cold with a cough and low fever, so I guess he might have caught that. He's been sleeping on a raised bed for the past few nights and I'm squirting saline solution up his nose. Is there anything else I can do to help him? Should I be taking him to the doctor or is it too early?