Headlights keep blowing fuses

[his15153]

So my headlights seem to keep blowing the fuse. After the fuse blows, I have to switch to the high beams, which don't seem to blow any fuses. I changed the headlight switch, thinking that it might be the cause. I have driven the truck once at night since then, and the headlights worked for about 10-15 minutes, before it blew the fuse. Now, when I put the high beams on, all the lights flicker on and off. If I turn the lights off for a few seconds, they will stay on for a minute and flicker again.