During the past year, anxiety about the onset of Obamacare has created a chill in some parts of the economy. While large health care businesses — insurance companies, for instance, and hospital chains — have poured significant resources into preparing for millions of new customers, countless investors have appeared spooked by the perpetual threats to repeal, or at least revise, the law. According to Thomson Reuters, private equity investment, usually the lifeblood for entrepreneurialism, has dropped by an astonishing 65 percent in the health care sector this year.