This is more than just not liking travel. This kind of reaction to travel either is the result of a physical ailment that is exacerbated by the physical stresses of travel or is an extreme emotional/psychological reaction. Either way, the pain and the disability are all too real, and you deserve a lot of credit for gutting your way through it.
If it's emotional/psychological, there are things you could do to significantly reduce the problem, or possibly eliminate it. If it's physical, maybe not so much. You already did everything I can think of to mitigate the physical impact of the trip. Your doctor might have some ideas on the subject. Since you expect to travel again regardless of your feelings on the matter, isn't it worth it to see if there's something you can do to change your situation for the better?
no subject
If it's emotional/psychological, there are things you could do to significantly reduce the problem, or possibly eliminate it. If it's physical, maybe not so much. You already did everything I can think of to mitigate the physical impact of the trip. Your doctor might have some ideas on the subject. Since you expect to travel again regardless of your feelings on the matter, isn't it worth it to see if there's something you can do to change your situation for the better?