OK so it's been a couple of weeks, but I ran again today and I have been walking with my friend most days in the meanwhile.
Today I ran for 9 minutes first session, but I must have also picked up the pace because I got 1.75 times round the loop that took me 7 minutes to run last time. rested for 3, ran 3 more then walked home. 30 mins altogether. Breathing even less stressed than previously, but the humidity was getting to me on the second run (it was foggy earlier this morning), so I stopped before I needed my inhaler.
By Halloween I'll be able to jump out from behind a twig to scare people!