Well, I may get him a drink a little more often, and I'll ask him if he needs me to pick up anything (kleenex, paracetamol, nasal spray) when I go to the store.
Other than that my husband is a big boy. He doesn't need to be nursed through a cold.
Chicken soup, of course ! Home made by you, Campbell's won't do ! Include garlic to keep away vampires, add a little white wine for flavor and conviviality, hand some matzo balls or noodles for comfort. He'll love it, and you.