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If you are married you can't claim Head of Household.  You need to be Single or live apart from him the last 6 months of the year and  have a qualifying child.  Do you have any income yourself?  If you file Married Filing Separately you can not get most credit like the

EITC Earned Income Tax Credit

Child Care Credit

Educational Deductions and Credits

You can file Joint and file an Injured spouse form 8379 with your return to protect your part of any refund.