Don't allow yourself to get into the habit of dressing carelessly when there is 'only' your husband to see you. Depend upon it he has no use for faded tea-gowns and badly dressed hair, and he abhors the sight of curling pins as much as other men do. He is a man after all, and if his wife does not take the trouble to charm him, there are plenty of other women who will.
Don't brood; that way madness lies. Don't hesitate, if you catch yourself brooding, to 'take a day off' in the best way you can. Go out and gossip with your friend; get to a theatre where there is a play that will make you laugh; or try a concert or a cinema show - anything that will take you out of yourself. Take the brooding habit in time before it gets too strong a hold of you.