Just back from the gp, who prescribed 10 days of antibiotics. Race will be on day 5. She said I probably shouldn't do my first ever 10km race. I'm gutted. 
It would be really stupid to do it, wouldn't it, especially since its at 1.30pm and forecast is for a warm day. If it makes it a less stupid, I'm a slow plodder, so it's likely to take me 70 mins in the whole of my health, and I could walk bits. And I'll be at a wedding on Friday where I know no one, so I could slope off to bed and rest .
Did I mention it's my 10k cherry, and I'm gutted?