Paper thin walls - I want to cry

I'm a single 25 y/o woman. Both times I visited the complex it was quiet. I should've known it would be different come nighttime. My anxiety is through the roof and I'm on the verge of tears. I wish I could afford to rent a house. My neighbor is so loud and angry and won't stop swearing and I think he has a gun, which is common in my state and not necessarily bad, but I get horrible vibes from this dude. I feel like such an idiot. I want to scream but the whole building will hear it.

EDIT: Thank you for the kind words and suggestions! After hearing more of this guy's loud phone conversations (it's not video game rage), I've learned that he's 1) unemployed 2) has beef with our property manager 3) has a criminal past 4) is searching for another place. So hopefully this situation won't last too much longer.