Bronchitis and my 1/2 is in 43 days.

I've been working all year, starting from less than 5 miles in a week to 100 miles in August and September, and boom I was hit with Bronchitis, I've only run 4 times this month and my 1/2 marathon is in 43 days. I'm feeling a little down because I've worked so hard and although I know I should be back in the 'run' of things within the next week, it puts me way off my schedule.

My question is.. assuming I will be running again in the next week, what kind of running schedule can I effectively use that will help me be at my best for the 1/2 (energy level wise, although I had dreams of 2 hours.. I switched to 2:20). Any suggestions on a schedule would be nice or should I just hop back on my schedule that was a 13 week plan and pick up at the week where I am running again?