I have had the same problem for the past 4 weeks, can hardly walk. I have had it before and saw a podiatrist then. This is what helps me: stay off of feet as much as possible until they improve, wear full sole inserts in shoes (very good ones are now available in stores --- look for the ones made especially for those with arthritis or diabetes), take NSAIDS to help tame inflammation and manage pain (whatever works for you), stretch and massage feet gently every day, soak feet in warm water with or without epsom salts though the epsom salts really do help.
I am going to see the podiatrist today, will let you know if he recommends anything else that might be helpful to you.
Barb