Why would my body hurt more my legs then arms and back but have days i feel like i was run over.i am always so tired too.?

Any # of reasons: Without knowing more, any number of things could be causing this. Viral infections, overexertion, dehydration, depression, hypothyroidism, lack of sleep, fibromyalgia, certain types of arthritis, just to name a few. If it is going on for more than a few days then i would seek help from a medical professional!

Fatigue: Generalized tiredness or feeling like you got ran over by a truck is a common presentation to doctor's office. This feeling can be caused from one simple condition to a complexity of multiple conditions. A full history and physical is needed and possibly some basic labs.