Same problem with my right foot. I wear sneakers for a few day,then Im usually o.k.Woke up yesterday morning and couldn't put any weight on my right foot, which was red and swollen. Went to the ER, was checked in and then transferred to their non-emergent clinic (Fast Track). X-rays and lab work all came back negative. The diagnosis was plantar fasciitis and the treatment was an anti-inflammatory and insoles. I was also given a work release through 12/31, if needed. Foot is feeling much better today and I fully expect to be on road tomorrow.