Legs bothering me bad, burning and tight.?

P 4-5 months my legs been bothering me. They have a very burning feeling and hurt been getting some bruising as well around the side of my knee's. I thought maybe it was my shoes so bought knew shox and still get it not as bad but still there. A friend said restless leg syndrome which i have no clue what it is. I work at a warehouse im 25 and not obeist but am a little over weight but not enough to cause this geez. Anyone know anything it could be so i dont waste money to a specialist? Thanks.