you are catastrophizing. It is only natural with something as uncertain as MS to look at the blacker end of “what if”. In the early years of my dx I used to think that the worst scenario for me would be to have eye problems that stopped me driving or reading and to be in a wheelchair. Here I am many years later - I no longer drive, reading is a chore not a pleasure and I’ve got a bright red wheelchair…but am I a burden of no use to anyone? I hope not. I have a very full and happy life, I do lots of volunteering and my days are usually busy.
what I am trying to say is that you are jumping from eye problems to catatonic and there is a world of difference. MSers are remarkably adaptable and what may seem like a deal breaker to you right now would be just business as usual if it actually happened. The one day at a time advice that is often trotted out may seem a bit trite but it’s actually true. Don’t squander time worrying about what might happen tomorrow and completely miss out on today.
I have made finding ways to do things the sort of mantra of my MS. I want to get out and I can’t walk much so I use a w/chair, I can’t read but I still love books so I listen to audiobooks, I can’t drive so I use public transport. Neil has hit the nail on the head - MS symptoms are problems looking for a solution.
I hope you can feel better soon - if you are not able to shake yourself free of these black thoughts perhaps a course of counselling would help. I got very low after I moved house but a few weeks with a psychologist got me back on track, more positive than before.