Dunno if this'll help or not, but ...
I had planned to be an emergency doctor. I got my EMT license when I was 16, and I had everything mapped out: get a BS in biology, continue working nights/weekends (both for the money and the experience), then go on to med school.
My freshman year of college, I was diagnosed with rheumatoid arthritis. It's worst in my hands. I quickly lost the majority of my hand strength. One of the defining moments of my life was sitting in a doctor's office soon after my initial diagnosis. The doctor, a man completely lacking in bedside manner, asked me what I was majoring in. I told him my plans. He laughed and said that I needed to be realistic, because there was no way that I could be a doctor with hands like mine.
Ultimately, he was right, even if he could've been a bit gentler in delivering that message. I changed from a biology degree to a computer science degree. I'd had computers ever since I was very young, and my dad and I learned BASIC together, so it was something that I was interested in and liked doing but had never considered making a career out of it until I was forced to change my plans.
I still miss that dream sometimes, and sometimes when I see an ambulance go by with its sirens blaring, I remember what it was like. But for all that, I like where I ended up. I got a BS in computer science, another BS in math, and then a MS in human-computer interaction. I might not have a lot of hand strength, but I can type 100 words per minute.

I've got an awesome job that I find fascinating.
As I said, I don't know if this helps, but I definitely sympathise with you. Good luck figuring out what comes next.