You need to be involved with your taxes and know how they are being filed. I am NOT an expert, but minimum concern would be not paying enough and that can cause problems. Taxes can be filed separate while married. Just check into it, you are right to be concerned.
The retirement, depending on if it's an IRA or what kind of IRA, cashing it out early has substantial monetary penalty and may be counted as income, which will affect you taxes.
Check with a tax person for best advice.
M46,W41 D16,D18 M22,T25 BD 11/12 W moved out 01/13 Piecing 10/13 Divorced 01/15 "Whether you worry or not has no affect on the outcome. But, moving forward, letting go, and making changes can." UrWorthy