My dat of birth is 27th May 1974.I.E. I am 41 years old Indian woman. My weight is nearly 95 kgs and my height is 5'2. I am overweight.And am suffering from anemia too. But from the last 1 year while i walk i feel my knees are week and are not able to carry my body weight.Especially if i have to climb uo and down stairs.I feel really weak in my knees, please suggest what should I do