I just turned 56 and have been working as a cashier since Sept 2013...I ve always had back problems, but after 5 months at this job I developed plantar faciitis. I ve have completely flat feet my whole life but am now wearing orthodics....I do all the stretches etc., and my feet are much better. But now for the last 3 days I can t seem to bend over or down without this kind of pain I ve never had. It goes from my lower back, through my buttox and all the way down the back of my legs. I ts getting worse everyday....is this because of the change in my flat feet now being arched ??? The pain is not constant as it goes away within 30 secs to a min. The lower back pain kind of feels the same but not as intense as if my back was out. My fear is could this be the start of some desease like muscular dystrophy?? I would love to know what may be going on, as the intensity level gets worse by the day. Thank-you. Kathryn Willock