You can file for divorce in USA since both are staying in USA .
2) claim spousal support from husband . In USA you would be entitled to 50 per cent of his assets acquired after marriage
3) if your husband participates in divorce proceedings in USA divorce decree would be valid in India
4) if your husband abuses you lodge police complaint against him
5) in the alternative come back to India and file for divorce on grounds of mental cruelty
6) claim alimony from husband
7) mutual consent divorce is best option. It would take 6 months
8) contested divorce takes around 5 years in India