I wish I had dormed but I didn't. My college was about 45 minutes from my house and always had family/relatives pick me up/drop me off.
I never have had the need of any assistance in college or elsewhere, but I had seen kids in wheelchairs and they were being helped by staff members. What I mean was that they were being accomodated to.
What are your issues with feeding? The only thing I could think of is carrying a tray with your food? You can ask for a bag or bring your own bag/napsack, etc. There's nothing wrong with that.
The only issue w/the bathroom/showering is that they are usually public - meaning they are used by everybody. I don't think any dorm has its own bathroom unless it's an off-campus housing shared by more than 3 people.
You might have to carry a lot of your stuff in there - shampoo, soap, towels, chair if you need it etc - that's the only bad thing.
But look at all your options and stay positive in what you decide to do.
Many warm wishes to you.