I agree with Sunny. Find you a rheumatologist. I have lower back, pelvic, hip and knee pain and recently broke my tail bone. I have Ankylosing Spondylitis and am HLA-B27+. It hurts for me to stand in one spot for long, it hurts for me to walk for more than a couple of miles and it hurts to lay on either side for very long. I am 38 yrs old and could stand to lose some weight, ok more than some! It's very hard to do. The less weight you carry, the less stress on the joints and bones. I'm not trying to scare you at all, I promise. But it sounds to me like you need some answers as to why you are hurting like you are. Find you a good doctor, they are out there.