i was going to post a thread myself on this, i've also had problems with pins and needles. The first time was at the GNR from about mile 11 to end and at the end i couldn't stand on my feet, the st johns ambulance people said it caused by cramp in my feet , but to me it didn't feel like cramp. I'm upping the mileage again for the leeds half and am now running in asics 1100 (GNR was in mizuno mercury) and after 10 miles i'm getting it again. I wonder if i need a wider shoe or something, both of the shoes i've had are 8.5 ladies (normal shoe size is 7, and with 8 running shoes i get black toenails, hence size 8.5). Any advice much appreciated
PS I've also got IBS but this is just about under comtrol, but maybe it's affecting my feet somehow