My arms and legs hurt every time I move around too much or stand too long or lift my hand up. I cannot even do exercises, because my muscles burn when I try to do some exercise. My knees also hurt when I stand too long or carry weight. My knees hurt and give a twig breaking sound when I bend them. I also have back pain. A few months ago, the area of tail bone started aching whenever I sit down. The pain has lessened now. I am 25 years old and have been with these problems since I was 21 and I feel like I am 125. I have met a general practitioner and had some scans. He said that my bone structure was fine and my spine was a little curvy at the end. He told me that it was probably a nerve caught in between my bones and had worn out over time. He advised me to meet an orthodontist. Could you advise me on what I should do further?