Please take care of yourself, get to a healthy strong weight, and PLEASE don't drain yourself by training when you have low WBC and Fever??!!

Even with moderate exercise your needs will be around 2400 kcal/day, what with lots of training that you're doing - maybe you need more. Have you talked to a nutritionist? Also about the osteoporosis. We know your predicament, this is serious. Get the support you need.