You take the bedroom and DH gets quarantined on the couch. A D&V bug should pass soon. Then DH can be un-quarantined.
Food can be delivered. Order pizza, Indian, Chinese, whatever you like - you could order enough for a few days if you like.
Do nothing but keep your fluids up, eat delivered food and rest.
When DH recovers he can deep clean the bathroom thoroughly, wash towels, and spray with disinfectant things like door handles, cupboard knobs, toilet handle, fridge handle, and anything else he has been in contact with.
If you have rubber gloves, wear them in the bathroom apart from when you wipe. Don't touch the toilet handle with your bare hands. Keep your hand towel separate from DH's, in your bedroom. It's not always possible to tell towels apart if you visit the loo to throw up at 2 am.
Make DH wash his hands frequently while he is ill.
Open windows even if it's cold out.
This happened to me when I came out of hospital with DD2. DD1, DS and DH all came down with a vomiting bug within an hour of us arriving home. I had the best post partum rest of my life as DH and the older two needed no food, and DH could just about help the DCs by emptying basins and flushing the loo as they threw up. He recovered first and took them to the doctor, but of course the doctor only said 'give them gatorade and ice pops and keep them away from the baby'.