Hi welcome to HCM. I read your question and I understand your concern. If it is 40 nanogram per ml then it is quite normal, no need to worry about it. Rest is the back pain so in my patients of your age I usually prescribe skeletal muscle relaxant like Tab. Nuberol forte 1 three times daiy along with calcium supplements like Tab Qalsan D, 1 tablet daily with bed rest and avoidance of heavy work. Meanwhile you can massage that area with wax and place pillows under your both knees while lying straight in bed, it will help relieve the backache. I hope this might be of some help. If you have any query feel free to ask. thanks