Everything, including me, is burning. How am I supposed to survive?

I just bought Don't starve. I knew the game was hard, but last time I played it, it was at least somewhat survivable.

Now, when I start the game, the character starts dying from extreme heat. Trees, appliances and critters catch fire too. It's pretty much like playing in hell.

I even died when I decided it's OK to cheat for full health under these circumstances - the forest around me cached fire and I died pretty much instantly.

I know I can craft Endothermic fire, which cools character down. But to craft it, I first need to collect lot of items. But I can't walk out of tree's shadow, because the heat will kill me.

How am I supposed to survive? My record so far is 5 days while cheating!