I HAVE PAIN IN MY LEGS - MOSTLY FROM KNEES

I HAVE PAIN IN MY LEGS - MOSTLY FROM KNEES DOWN TO MY TOES AND OTHER TIMES ABOVE MY KNEES ON MY THIGHS. I ALSO FIND IT TO BE PAINFUL TO WALK AND STIFF. UNBEARABLE AND PAINFUL. PAINFUL WHEN SLEEPING UNLESS LAYING STRAIGHT SEEMS BETTER. AT TIMES ITS BOTH LEGS AND OTHER TIMES IT IS ONE LEG. PAIN WITH A TINGLING FEELING. ITS HARD TO WALK UP THE STAIRS (10 steps). ITS TO PAINFUL.