I Don't Know Who I Am Anymore

My life can be very clearly divided into before and after psychosis.

I used to be so full of life and motivation. I was in the best shape of my life. I read 52 books a year. I enjoyed hiking and spending time with friends and traveling.

Now, nothing brings me joy.

I can't find it in me to do much of anything.

Why did this happen to me?

How do I make it stop?