Your complaints of sleep and appetite disturbances, lethargy, backaches, headaches may well be a part of psychiatric disorders, howsoever you first need to get evaluated for medical problems like anemia, thyroid disorders , osteoporosis etc. Which may present with similar complaints. Kindly visit a physician for a thorough evaluation. If there is no medical cause, then kindly consult a psychiatrist as soon as possible for appropriate management. Taking sleeping pills by self can do more harm than good. In the meanwhile, practice sleep hygiene techniques ( available on the net), try going for a 15 min walk daily and do some pranaayam. Eat fibre as in fruits and vegetables, drink plenty of water to stabilize your bowel habits and involve yourself with friends and family. I hope this helps but kindly seek medical help as soon as possible.