Sorry you and DH are having this experience-it is understandable, as some have suggested, that he is feeling helpless...my DH is a problem-solver, and he knows he can help "fix" things for me by helping me.

Denial of your condition is his fear of your future together coming out...he is voicing his fears of you ending up in a wc, which is at least honest of him.
Once my DH & I went to a workshop for partners in dealing with MS. The leader suggested that as much as we patients want the MS experience to be over at times, our partners might feel the same way. My DH said, "I do..." that was the first time he ever expressed how it was impacting HIM. Most of the time he's the cheerleader for me. It gave me a perspective on how MS affected his life.

On the NMSS web site, there is a section for partners/caregivers. Perhaps it will give your DH a place to gain insight on how other partners deal with MS in their loved ones' lives.

He probably feels as alone with his feelings as you do...he might feel things like "I didn't do anything to get this in my life"...and probably feels guilty having negative thoughts about the impact it is having on him.

It might help you to find a support group for couples dealing with chronic illness as suggested...and none of us knows the projection of our disease in the future...we only have this moment. I was watching a show with Gary Zukav, who wrote an insightful book called The Seat of the Soul. Anyway, an audience member was discussing how she and her husband were contemplating separation, and she kept saying, "but..."
gary gently interrupted her and said, "Instead of following "but" with a complaint or a fear, ask yourself, "but...now what?"

You and your husband need to ask one another honestly, "now what?" MS is in your lives. There's no getting away from it. It helps if he can get some kind of support for caregivers or partners, or maybe couples counseling. It will also help him to grieve for what has been lost-his vision of life as he'd planned. You will benefit from acknowledging to him that you grieve that also, but we are NEVER guaranteed what we dream...
as they say, life gives you lemons. Sometimes LOTS of them...you either can cry about all of the lemons that were dumped on your driveway, or get busy, take the sugar in your life and make lemonade.

Try to point out what you CAN do, even with MS. It helps us as patients to keep that in our minds, because we can get very depressed and overwhelmed by what we can't do. If you end up in a wc, it doesn't mean you can't go places and do things-on the contrary, it can make dealing with MS easier if it is needed.

Keep us up to date on how you're doing...

Thank you for sharing your predicament-it helps all of us look at our way of dealing with MS, and getting out that container of sugar to make more lemonade...