Ache on feet and lower legs

Dr, I have had ache on my feet for over 2 years, I was taking walks every day, everything was great, one day I woke up with my left forefoot hurting, did not go away, went to podiatrist, had me on a boot, pain never went away. Then both feet, have had 2 MRI sesamoid bones a little inflamed then everything normal. Have been to 2 different podiatrists, 6 different pairs of inserts, one orthopedic doctor, chiropractor, acupunture, and last a neurologist. Blood tests all come negative, urine test negative also. Recently I have pain like shin splint pain, and on my feet cramp like pain. I am sitting down at work all day long. I am not standing for long periods of time at work. Any idea what could help me?