Sounds more like an acute strain, or partial tear, of the plantar fascia, rather than the classic chronic plantar fasciitis. This should respond to ice, stretching and rest. Try to waer a shoe with a good arch, even around the house and particularly when you get up in the morning. If the symptoms persist, there are night splints that can be utilized. In addition, platelet rich plasma injections have been very successful for the treatment of plantar fasciitis.
I rolled my left foot in a hole while running in July '09. I have had pain in the left side of my foot in the heel area. I can apply pressure massaging the heel area and feel a sharp pain. I had mornings where my first step out of bed was agonizing pain. The more I walked the more it hurt. I have used ice/heat/ibuprofen and nothing has helped. I started wearing my running shoe to bed on my left foot. I believe it has kept my foot straight at night and allows for healing. 4 months later, I have little pain in the morning. I also have stopped running since July. Rest means rest. No running, biking or walking. Take it easy and let it heal. Good Luck.