Millions of people who get their health insurance through the Affordable Care Act marketplace are bracing for sticker shock as open enrollment begins Nov. 1.

Without a deal in Congress to end the government shutdown and extend critical tax credits that helped many people afford their coverage, premiums are expected to skyrocket.

In Pennsylvania, nearly 500,000 people are enrolled in the state's Affordable Care Act insurance marketplace, Pennie . More than 510,000 people are enrolled in plans obtained through New Jersey's state marketplace , while enrollment in Delaware hit an all-time high this year at just over 50,000, according to officials.

More than 90% of marketplace enrollees nationwide rely on tax credits to afford their monthly premiums, like Jason Piperberg, a freelance

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