It will be difficult for you to prove that she FULLY KNEW prior to her marriage about her medical condition and INTENTIONALLY and KNOWINGLY concealed it from you. Had I been her advocate, I would have filed a DV case against you and asked for maintenance and interim maintenance under the DV Act. It is one of the rare instances where the DV Act rescues a woman because annulment of marriage is immaterial to the application of the DV Act. The fact that you were in a live-in relationship ("domestic relationship" in a "shared household") would provide a legal basis to your wife to seek maintenance from you.
In any event, it is pathetic, rustic and certainly archaic for a man to seek divorce from a wife solely because she is incapable of conceiving. If there are deficiencies in her character to compound this problem, perhaps your decision can be justified. However, punishing a woman SOLELY because she is unable to conceive attracts sympathy for her and not for you. The Judge/Magistrate may feel the same and it is most likely that you will be paying maintenance for the rest of your life - Both based upon legal as well as moral justification.
On a different note, I do not think that this would fall under any of the IPC sections though I am not an advocate to say so with certainty. Any of the otherwise applicable IPC sections would require knowledge, intent and motive and at least one of them would be missing in your case.
The problem with you is that you are trying to intimidate the other party with all kinds of legal threats and they are all going to back fire at you, if she gets a good advocate. Pray that that does not happen.
