My kitchen faucet is barely running
If the faucets throughout the rest of the home are fine, then just unscrew the cap at the end of the faucet. Within it is an aerator - basically a metal and plastic filter that also slows the water down. You've probably gotten a bit of something from within the pipes stuck in it. Typically they just pop open and can be cleaned out with a toothpick or such, but you can also soak it in vinegar for an hour to eat away the junk from within it.

Once it's clean, screw it back in and you should be fine. (If this was the cause)