Nobody likes to come back to the hospital, especially if you were just feeling okay before you went home, but we cannot always tell who will stay better or get worse. After a few hours in the ER, if you have the following symptoms, I would strongly recommend you go back to the ER, don't drive yourself because in case you can't breathe and need to pull over, it's just not safe. Inability to catch your breath or worsening confusion is a reason to come back. Using your inhalers more than your prescription says. New fever, chills, sweats, or phlegm, and you aren't already treated with antibiotics, is a good reason to come back to be seen. If you have new chest pain or nausea and vomiting, along with your shortness of breath, please come back to the ER.