For now, I would just tell dh, "Sorry, but we're both still sick and I need to sleep alone. Your coughing awakens me and I end up exhausted since I'm still sick myself." That will buy you time to decide if you want to keep things this way permanently and how to approach it.
Enjoy your trip!
The solar eclipse on Wednesday 12th August




you can always go in another room whenever is needed when you're ill.