I can understand why you'd be feeling resentment. You had legitimate reasons for not wanting to go on that trip for that long.
I agree it might be best to have the conversation sooner than later. So you don't have to just hold in that resentment about how it made you feel and so you can work out the plans for the next trip and not just worry about it.
Something I noticed from your posts was that it didn't seem like he was very willing to budge once his mind was made up. Not even the hospital kept him from wanting to go on that trip. So, to echo what Fern said, maybe you can decide together what will work for you both and come up with a plan in advance for this next trip. It didn't seem like you got much say in terms of plans for the last trip and I think you deserve to have input and be heard.