Can a talent be lost?

Yes, I believe you can gain it back. I am in a similar situation. I used to love writing and always felt very creative, but the past year has been like permanent writer's block. With all talents, they must be practiced. I started journaling again every night-weird random things, and scetching ideas. So far, it's been great for me! I also recorded some dreams, and just writing again has made me feel happier and less stressed. Good luck :)