1) you can obtain divorce from your husband under provisions of Dissolution of Muslim Marriages Act 1939: on the grounds of cruelty
2) having an extra marital affair amounts to cruelty
3) accusing wife of having an extra marital affair amounts to cruelty
4) you can in divorce petition seek custody of your child . Among the Hanafis, it is an established rule that mother's right of hizanat over her son terminates on the latter's completing the age of 7 years. .
5) court would atleast award you visitation rights