Hey Becky!
You just inspired me to join the forum...
I started C25K 2 years ago, got to about the 4th week, got bronchitis and quit. The coughing was one thing, but running with my knees together so I wouldn't pee my pants while coughing was difficult. 
I'm 31 also. 2 years ago during the running program, I got down to 169lbs. Now, 2 years of anti-anxiety meds and no exercise, I'm about 222lbs. And I should mention only 5'3. 
Anyhow, I am wanting to start again, and was unsure if it was safe to start at this weight. I really have no desire to start walking, because the results when I did it before were sooooooo fast and obvious. You get a major "high" from running. That's what makes you want to keep at it. I was just too embarrassed to ask anyone if I can do it at this weight.
This was meant as a private message, but think I'll post it on the forum too.... part of me committing to the program... 
Did you begin the program yet?