Not a dream but I need some advice

Date: 9/1/2016

Hi I'm dreaming a lot lately and it's getting me really stressed out. Dreams stay in my mind for at leasy a day, if not longer, and it's mostly about things that make me feel uneasy or unhappy (like getting back together with my ex, whom I know I miss without the dreams already). Does anyone know how to stop dreaming so much and intensively???