Do you live with your husband?
Are you an US citizen? Did you file an immigration petition for your husband? Was it accepted? Do you have a receipt?
Do you have any dependents living with you?
Please let me know any other details you think are important.
If you files Petition for Alien Relative I-130 for your husband - you may also apply for the Work Permit for him. That will allow him to work legally.
You may use Head of Household status. Please see the IRS publication 501 page 7 - http://www.irs.gov/pub/irs-pdf/p501.pdf
You are considered unmarried for head of household purposes if your spouse was a nonresident alien at any time during the year and you do not choose to treat your nonresident spouse as a resident alien. However, your spouse is not a qualifying person for head of household purposes. You must have another qualifying person and meet the other tests to be eligible to file as a head of household.
However that would be more beneficial to file a joint tax return. Please let me know if you need any help.
Yes - if you need to file quickly - you may select that you are not married based on the reference above.
However that would be more beneficial to file a joint tax return. That way you will have additional deductions for your husband. You may apply for tax ID for him and file a tax return at the same time - but in this case you would need to mail your return - and will not be file electronically - so that would take longer to have your refund
Even if you file as Head of Household - you amend your return later - generally you have three years to claim additional refund.
If you provide your total taxable income and age of your children - I will estimate if you are entitled in any additional refund.