*hugs*
I agree that it's perfectly normal to be nervous and upset about moving.
As far as another SD having a problem with your SD in a way that would be aggressive enough to be a problem, a truly trained service dog shouldn't have that problem. I think you'll find that Nalla does fine with any roommates you might have for the same reason.
I don't have the same disabilities as you, but I've spent a good portion of my life feeling like I messed up and worried that I'll do it again. What I've learned simply is that it's still worth it to try. If in a worst case scenario, you have problems and you go home. It's not the end of the world and it doesn't mean that you'll never be able to live on your own or anything. It took me 3 tries to finish college. And that's okay. No one will think less of you if you get to a point where you realize you've hit your limit at that time. But it's important to remember that limits are not static. What you can't handle today, may be possible in a year or two.
Also, the biggest advice I can give you is to not sweat the small stuff. I'm currently living in NYC on my own and medically a mess because all of my energy and health is going to my effort to not to give up working. This means that I don't cook for myself. I order most of my meals. Pretty much anything I do cook is in the microwava. I use disposable plates (yes, microwave safe ones exist), cutlery, and really do my best to make things like clean up as simple as throwing things in the trash. Yes, it's horrid for the environment and expensive, but it's that or not being able to be independent (due to brain fog and fatigue even if I wasn't working, I'd not have the energy to do "real" cooking very often) and I see that as a smaller price for me to pay because the independence bit is important to me. So do what you need to do to make yourself happy and don't worry about all the details that someone else might see as important. You will be able to do it.
Good luck!
Also, while I know we don't have the same disabilities, feel free to PM me if you want to talk to someone or vent at someone with recent experience at going to a new place and getting a job alone while having a disability. (I graduated, moved to NYC, and started working at the end of May)