Positive thing is that I managed to do a climb I had not been able to do before. I had to "smear" - put my foot directly on the wall, without any holds, so I could get across to the next hold above me.
Negative thing is that I damaged my toe again. I kind of thought I would - but I also thought, f*ck it, it's worth a try.
I am now sitting at home, with a little bag of frozen strawberries inside my sock, to cool the foot down. One of the instructors at the gym said it's worth a try - it might make it better a little sooner.
Positive thing is that, in about 5 minutes, I am going to have strawberry dessert because my warm foot is very effective at defrosting the strawberries.