I don't know how this happened!!! It's like no amount of coffee will fix it. How do you avoid getting anxious over it? I want my old brain back!

Any tips for staying focused? I get so bored and start ruminating on sad stuff. It takes foreeeeever to get a simple project done. Oh yeah and sleeping! I get so, so sleepy! They keep the library here really cold and it's the perfect temperature to just bring a hoodie and nap. People talking on their cell in the stacks really lulls you to sleep too.