Why does my kitchen faucet suddenly have too much water pressure?
Here are three different options:


Installing a more restrictive aerator on the faucet.
Installing ball valves on the incoming water lines.
Installing a water pressure regulator.


Since you said it hasn't always been like this, and it seems as though the faucet is the only thing you're having problems with, I would go with an aerator first.  The old one has perhaps fallen out.