After all my worrying and panic, I actually completed the dreaded run ! I'm beaming from ear to ear.
Someone on here recommended breaking the run into smaller chunks. That actually helped a lot. I ran 4x 5 min runs in my head
I listened to a podcast rather than music for the first time. I always thought I wouldnt be able to concentrate on a podcast but that wasn't true. I actually dont remember much of the run at all because I was listening so well.
I struggled at 1:30 mins lol. First time that's ever happened but the gremlins nearly won. I considered stopping so many times in that first few minutes but I eventually shook the gremlins off and carried on. They resurfaced at 16 mins but I just clock watched those last few minutes and worked through it.
There wasnt actually a point where I felt physically unable to continue. It was a complete mind exercise that I eventually won.
Thanks for all your help. I DID IT !!!