Backinthesaddle

Im really not sure how the toes number but I have had severe pain on the bottom side of my foot, I guess the ball of the foot between the baby toe and the next toe. It started in 2005 while I was pregnant. It doesn't matter what kind of shoes I wear or if I wear shoes. Some days it doesn't hurt at all and others it hurts and I have to take my shoe off and rest the foot. I see the foot doctor on the 17th. Any ideas of what it is?