You should go to a doctor. Sleep is complicated and extremely important for your health. They will help you. There is a book called something like The Harvard M

You should go to a doctor. Sleep is complicated and extremely important for your health. They will help you. There is a book called something like The Harvard Medical School's Guide to a Good Night's Sleep. You could check it out for an overview, but not in place of seeing a doctor. Also, don't use a computer or any other illuminated screen in bed (or ideally an hour before you sleep).