Form 8379 & owing the irs

My husband is paying back child support so they took our entire $2400. I am trying to fill out the form 8379 for injured spouse and get my $1200. But it wants out “tax” information. That would be fine except that we owe the irs money. We have to pay them so I don’t think filing this form with that information is really going to get my money back. Please help me. I’ve looked all over for help and I can’t get thru to the irs on the phone. Thank you.