I was into this giant loop of not believing in anything, even my whole existence and it became a serious psychosis multiple times. Everything was blank and i was waiting for someone to tell me that my game is over. I dont know how to explain it but after i read about descartes i found a bit of inner peace and less anxiety. Everything maybe false except for my existence. I mean .. i cant deny the fact that i am thinking in this moment. There is actually a truth that cant be denied in anyways. It really helped me.