I would say first and foremost that from your discussion you should really have a competent tax professional - an accountant or CPA with expertise in foreign matters should suffice - to advise you on preparing your return. Preparing tax returns in situations such as yours can get complicated very, very quickly, and it's easy to make a mistake: in addition to whether or not you qualify for some or all of the foreign earned income exclusion or partial exclusion of the gain from selling your house, there are also potential tax treaty benefits you might be able to claim, foreign tax credits, and other issues that are not easy to work out by yourself.
Also, with respect to your filing status for 2010, you don't get to choose whether to file as single or as married. If you and your husband were married on December 31, 2010, then you were "married" for income tax purposes and must file as either married filing separately or married filing jointly.
Lastly, please do not rely on answers you get for free online from strangers whom you've never met and whom you've not retained to advise you. In particular, do not rely on any answer that purports to solve your problem - there are a lot more facts you haven't described that are pertinent to your tax matters and it would be impossible to get all of them adequately addressed in a free online forum such as this. In other words, please don't take candy from strangers.
My answer does not constitute legal advice and may not be relied upon by anyone for any purpose and does not constitute an attorney/client relationship or an offer to form such a relationship. This disclaimer is intended to be fully compliant with the requirements of Treasury Department Circular 230 and the terms thereof are fully incorporated by reference. If you wish to consult with me please contact me at dana@nytaxcounsel or visit my website at www.nytaxcounsel.com