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.

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.

Did you mean renal ‘collapse’?