My health insurance expires in 2 hours, what should I do?

Im covered under my mothers health insurance and it expires when I turn 19. Any good health insurance plans out there.
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Unless you're planning to enroll in COBRA (which is expensive), you should have already been applying for policies and had a new policy lined up to ensure that you don't have a significant break in coverage. I guess its a little late for that now, but you should have started asking this question 6 weeks or more ago. Start getting quotes from brokers, try ehealthinsurance.com, consider the COBRA option (if its available to you), look into finding a job with insurance benefits, etc.
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