Hi Jayne, as a person who gets easily motion sick (and yes I have had my bouts on board) I understand your dh's pain. In fact, we just got off the wonder on Sun. You didn't say how long of a trip you were taking,I'm not sure that matters or not. You also didn't mention whether he had tried any medicines, ginger or the very stylish (lol) bracelets. I made the mistake of only taking 1 dramamine (less drowsey formula) instead of the maximum dosage of 2 because I thought it would make me sleepy as well. The first night I took 1, but the last night I decided to take 2. We had storms both of these nights. I really didn't feel sleepy, and I weigh about 110 lbs. Of course, everyone reacts different to meds. Also, I took the dosage later in the day (around 4:00pm), so that if I did feel sleepy, it was toward the evening and nightime. If he hasn't previously tried the meds. he might just give it a try at home first to see how he reacts.
These are just some thoughts to help you get him on the cruise. I hope he decides to go. Even though I was pretty sick the first night, I'm ready to make my reservation again!
Good luck, Lorie