HOT headlight Switch? Don't know why

It's hot because it's normal. With no relays in the headlight circuit, the headlight switch carries all the load and it gets hot. The stock switches are simply inadequate to carry the load. That's why I upgraded to @crackedback" headlight relay harness. It removes the load from the headlight switch and only uses it to trigger the relays turning the lights on. It also puts alternator voltage to the headlights and makes them noticeably brighter. I highly recommend the upgrade. It's well worth the money.