Your nurse's advice is pretty good, actually, and it looks as though you've taken her up on it, at least to some extent. Because the point of exercise for COPDis to build stamina and endurance, I'd suggest that you slow down your speed, and go for longer time; at least 30 minutes and preferably 45 minutes. You can maintain the incline if you want, but incline bursts throughout the exercise will help you build both strength and stamina. You should also be working with weights: building upper, lower and core muscle groups. You should be working each group at least 30 minutes a week.

You could block your nose with cotton wool to stop it running lol and breath through your mouth hope it helps

I find my nose also runs when on the treadmill

Thank You Jean