What Causes Burning Sensation In Feet On Applying Pressure?

i am suffering from Burning Feet for past about 5 years. if I stand and / or apply pressure on my feet i feel burning sensation, and if i lay down then in an hour or so the sensation decreases. The repeated tests clearly rule out any kind of diabetic problem, and other cholesterol levels are well within the limits, and no any kind of infections. I am very cool and calm I followed doctors advise and tried many medicines, but i am not revealed from the said problem. I look for your advise.My food intake include drinking water of about 3 liters or so (early morning first about 4 glasses) and one cup green tea, milk with oats,