If it continues, you could possibly have plantar faciitis. I do have that and when it was bad I could barely put my heels on the floor. It felt like someone was driving a stake through my heels. I started wearing Birkenstock shoes and they have really helped me a lot because they stretch the tendons in the foot. They have great support, too, but it did take me about a month to get used to wearing them. I wore them just a little each day.
I also take vitamin D3 like Gail does and that helps too.
Sherrine