Concerned about your health? Experts from Robert Wood Johnson University Hospital Hamilton are ready to answer readers’ questions. Send your questions to askthedoc@rwjuhh.edu. Q. I’ve been feeling stiffness throughout my body, I’ve gained weight and I’m really tired, although I haven’t changed my routine for years. My sister thinks it could be something with my thyroid, but I think it’s just what happens when you get older. What should I do?