Hi Guddu,
If you are genuinely leaving because of health reasons, get a doctor to certify it. Attach the certificate with your resignation and get the same delivered to HR to obtain an acknowledgment. Also, write another letter addressed to HR with a CC to your MD, requesting permission to quit without completing the notice period and expressing your willingness to give one month's salary in lieu of notice. I am sure this will get you the desired result.
Thank you,
Regards,
R. H. Kavarana
HR Manager
Mumbai