I experienced something like this years ago, I was so bad at math and physics, one day I woke up and I felt completely different, as if my eyes were fully open, I became very good at math and physics, I fell in love with science in general, became one of the best in my highschool. I had a state of 24/24 of happiness, love for everyone and everything, I was smiling all day, then some years later I found myself stuck in depression. That incredible clarity is still here but I can't use it because I suffer from a very deep depression.... I also experience from time to time this incredible state of awareness, but it only lasts for a day or two..... because depression always comes back... I feel that my life has been stolen from me and there's nothing I can't do.....