> What is the source of these supposed "natural born rights?"

The US Declaration of Independence lists it:

> We hold these Truths to be self-evident, that all Men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty, and the Pursuit of Happiness

But I’m not sure what you mean by “origin” and clearly these truths are not self-evident to some.

> The federal government doesn't have the power to regulate medical care

Tell that to the FDA, DEA and FTC.

> That's not what it says! It says: "the right of the people to keep and bear Arms, shall not be infringed."

And yet we’ve regularly infringed that right if that right is interpreted at the individual level. Also “arms” as understood in the constitution was specifically around personal weapons an individual could carry (muskets, pistols, swords). Not necessarily machine guns or weapons of mass destruction; even Scalia, one of the more conservative justices recognized this, writing in Heller that weapons that are “dangerous and unusual” (e.g., machine guns, bombs, or military-grade explosives) can be restricted.