Firstly, your spotting calls for medical attention as it is post-menopausal. The cause of the bone pains could be osteoporosis
as you are not on any nutritional supplements that are supposed be taken around menopause; you would need to exclude other orthopedic causes and get a bone-density scan. Exercise, when performed in odd postures can cause pain, so please have a watch on your posture during work outs. Please visit an orthopedic and a gynecologist and get further management. Good luck.