I would like to second the suggestion that you consult your doctor. I also recently was having some foot pain, and I just ignored it until it got pretty uncomfortable. My pain was in the heel and my diagnosis was plantar fasciitis with multiple small tears in the tendon on the bottom of my foot. Fortunately, it was something that was able to be cleared up with a foot-wrap and a round of steroids, but I also found out that I need to take special care to prevent further, more serious injury - so I got lucky this time that I didn't hurt myself worse by ignoring it. Also, those couple days where it hurt to walk (and I have a job that has me on my feet a great deal) were pretty brutal.