To help with bills, you can also call the hospital financial department. Any time you have a bill with them you can apply for financial aid. I got 75% of my bill wrote off. It all depends on your income and the bills you have to pay, so you will probably get even more of a discount. But most doctor's offices don't have this option available.
I have double vision, constantly. I don't notice it being worse when riding in a vehicle in general. I do notice that being in a vehicle at night is worse, while it's raining is just as bad as night time, and while it's raining at night is the absolute worst!
I was 23 when I was diagnosed. I know it's scary. But you did find a great place for support. The people here are amazing.
I'm sorry for all you've been going through.