My whole body fatigues all the time, both of my legs hurt , both of my knees hurt where my kneecaps are, i also go thru alot of anxiety and stress?

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated.