I have slight aching on my back and on my knees. nothing too serious. i walked a lot today and didn't sleep as much. i'm scared of bone cancer.

Do not worry: What you described is not a manifestation of bone cancer. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex. Get HPV vaccine.