The Preamble

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.

Affordable Care Act info

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A quick clarification: “Obamacare” and “The Affordable Care Act” or ACA are the SAME THING. The ACA was nicknamed Obamacare by Republicans who wanted to vilify it. 
If you are insured under some program in your state, or “the exchanges,” that IS Obamacare and that is what Republicans are repealing. I repeat: the Republicans are trying very hard to take away your insurance if you are covered by any of the exchanges, the Affordable Care Act, or a state program funded by the ACA (or Obamacare).
And even if you are insured by your employer, you’re in danger of losing all the great things we got from the ACA– guaranteed coverage even for preexisting conditions (this is a big deal for anyone who has ever been diagnosed with ANYTHING including if you’ve ever seen a therapist for mental health), being able to keep your dependents on your plan until they are 26, and the decreased costs from mostly subsidized well child and preventive care. That’s all Obamacare/ACA too. 

Tl;dr: Obamacare IS the Affordable Care Act, and the Republicans are determined to take your health insurance away. They do not have a plan to replace it. If this concerns you, now is a good time to put some pressure on your Republican Congresspeople and let them know that you don’t want to lose it.