I have also experienced that. If feels like there direction-less flow of thoughts about a lot of things and nothing to focus on. I got help from Vivekananda's

I have also experienced that. If feels like there direction-less flow of thoughts about a lot of things and nothing to focus on. I got help from Vivekananda's books. He mentions that the ability to concentrate is the only difference between humans and animals. And the degree of focus determines success in human life. But he warns that learning the ability to focus without learning how to completely get out of the mind-thought complex is like going inside a complex maze without the map. His books are quite small and can be finished in a few hours. Worth reading.