How fast should I go losing pounds with diet and training in a healthy way?

No, it is not safe to smoke or take any kind of drungs when you are unwell. If may have extensive adverse effects as your immunity is already low.

Usully, fever is accompanied with increase in the body's temperature, weakness and body ache. Incase you feel any of these symptoms, you can take a Paracetamol. If the fever doesn't subside or keeps reoccuring, contact your doctor immediately.

hi Kalpana. Your symptoms direct towards a spinal nerve injury. Did you have a recent fall or lower back injury that involved you being on bed rest? You must undergo MRI lumbar spine and then see an orthopedician for further intervention.