brake lights won't work unless headlights are on

I'm assuming you mean that the brakelights work normally if the headlights are on. I've been looking at the electrical diagram for your car and I don't see any likely, logical way that would happen. There's a possibility that the taillights are feeding back through the brakelights and brakeswitch in combination with a blown brakelight fuse and a short to ground in the wiring. But that's kind of a wild possibility. I recommend you find an auto electric shop or a Toyota specialist to look at it. If you want to find a specialist, here's a directory link for you: https://repairpal.com/toyota-repair-in-hillsboro-oregon