I had the same thing and it caused me no end of pain. I refused the injections offered as I knew it would only be a short term fix, and went to a physio, who gave me some easy exercises to do, and when in got really bad, I would roll a cold can under my foot for relief, it worked for me! I also invested in a new pair of runners, I couldn't afford anything too expensive, so ended up with some from Skechers, which worked a treat, they were from the local DFO outlet and drastically discounted, I think they were about $40, but they were from their shape ups range, which are shaped differently and gave me the support on the arch that I needed. It only took a few weeks of wearing them and I was back to normal!