Ah, darn, it's not going to get any better. I'm sorry to hear that.
f I were you, I'd build up a bike with a single chainring, get rid of the front derailer, and move the front brake and rear derailer to the same brifter on the right side. I'd also invest in the best front brake caliper and pads money can buy, so you always have enough stopping power. You can presumably use your bad left hand to at least steady the handlebar while you're shifting or braking, yes?
If I were you, I'd stay away from anything particularly hilly until you've gotten very familiar with the new set-up. Take it slow, and try to find enjoyment in other kinds of goals, like distance endurance, until you've mastered the new challenges. Good luck, and keep riding no matter what!
- Warren