Want Divorce from husband due to his impotency

I am a Hindu Brahmin Woman.I am 36yrs of age & 5'8" height,weight 95kg.My husband is impotent & after several consultation with doctors they suggest that nothing to be done and we have no child at all.I want to be a mother but my husband has no capability to intercourse with me.I have done everything possible from my end but all are in vain.Now the doctor of my husband has suggested me to remarry someone for my sexual satisfaction and for being a mother,as since seven years there is no sexual relation between me and him,So I want to marry again.