1. Are you suffering from early morning stiffness
in low back?. does the stiffness decreases as the day goes? If it is so, you might be suffering from spondyloarthropathy
2. Pain in feet
near the heel during initial steps of walking more in the morning is usually Plantar fascitis. Causes can be many - recent weight gain, prolonged standing, decrease in arch of your foot etc.
3. For spondyloarthropathy it is advisable to get an Xray of your Lumbo-sacral spine and proceed.
4. For Plantar Fascitis - stretching exercises for plantar fascia, USG to the heel, Modified slippers/ insoles with cushioned heels/medial arch support
to be used both indoors & outdoors, decreasing body weight can help. Altering the weight on each foot during prolonged standing can be useful.