For the past few weeks, Shana Verstegen has been "sick to her stomach" wondering what might happen to her family's health insurance next year. Ms Verstegen and her husband both work for a small business as fitness trainers, meaning they have to pay for their own plan. The Wisconsin parents of two have saved an estimated $800 (£601) a month on their health insurance through Affordable Care Act, also known as Obamacare, premium tax credits. Set to expire at the end of the year, the federal