Lyric discussion by Crownedhopeless 

Cover art for Panic lyrics by Pretty Reckless, The

Not to state the possibly obvious but it could be about a mental disorder? Bipolar or Borderline maybe? It's kind of a "I hate you, don't leave me" thing, in my opinion. Generally I feel like there's a lot of conflicting feelings in this song. The narrator is saying that she loves (is IN love) with the person but at the same time, she hates them. It's a mix of wanting to be left alone and wanting to purposely drag this person down with them. Also, mania is literally over enthusiasm/excitement, to an unhealthy degree. So this person may make her so happy and so depressed at the same time. Anyone who has a mental illness will know where I'm coming from with saying that the narrator seems to be giving up on herself and telling the other person "Get out while you still can"

In a nutshell: You make so happy and so sad, you need to leave me because I'm beyond saving, I'm too fucked up. If you don't leave, I'll just drag you down with me.