You are incredibly brave. I salute you. Having limitations isn't a failure it's a challenge. It means that everything you achieve has been earned and is all the more valuable for it. A life full of challenges is a life full of success and fulfilment. You have family. You have friends. You have a boyfriend. You have intellingence and courage... how could you POSSIBLY fail?
I know what a life of challenges is about. I have a back problem which means that my discs are slowly crumbling away. To add to the problem I broke my back in two places ten years ago. Ishould be in a wheelchair but I'm not because I chose to deal with the pain and get on with it. I should be tranked out on pain killers but I'm not because I refuse to take them and find other ways of dealing (or not dealing) with the pain.
Now I have been struck down with an illness, something like yours in that no one seems to know what is going on. It is rather frightening because I am not allowed to drive which, due to my back condition, makes me pretty much house bound. I have constant headaches, my speech is degrading so I have a stammer and sometimes just can't speak, I have serious memory problems and blank outs. But I am still working, albeit part time. I am still writing and I am still looking forward to moving and getting a new life.
If I can do it anyone can do it and I am damned sure from what I have read of you that you can do it. Lofty dreams? Of course. If you don't reach for the stars how can you ever hope to reach them. If you keep your eyes on the stars you don't see the shit you are walking through and if you have to stop now and again to get someone to help you scraping it off your shoes then so be it.
Good luck on your course although I am sure you won't need it