I have been getting sharp stabbing pains in my right heel. It s worse after each run and I have to stretch my foot by flexing it towards my knee, right and left to make it go away. Recently it has been getting worse and as I'm now on w7 with longer runs, it's putting me off. My right foot is half a size smaller than my left foot, and I have gel insoles in both trainers. What can I do. I don't want to give up now. Thanks for your advice.