1. Well,the material suppression of fact is ground for declaring the marriage as null and void.
2. However on your case you have stayed with him long time so you can take this plea of material suppression.
3.So your relief lies in suit for divorce on the ground of mental cruelty which though takes time.So you can approach him for mutual divorce which takes six months time.
4.if he does not return your stridhan or provide monthly maintenance then you can file case under PWDV Act or u/s 406 IPC.