What Causes Pain In Bottom Of Feet?

Hello.I am 46 years old male.My feet bottoms(from heel to toe)have been aching for 3-4 years.Finnish doctors have found nothing else than density of my bones is on the border of osteporosis.I have been eating calcium tablets for 4-5 months and it doesnt help at least yet.Last fall my buttocks started to ache to after sitting 15-30 minutes.I have been eating lots f candy last 15 years,but last fall i thought that's enough and quit,after eatin candy my feet are worse for 2-3 days.Can this be common on some other country,googling did not bring any results.I have always been drinking quite little of water,now i have tried to drink more and my feetfeel worse than before.