LONG POST IM SORRY

I have had an extremely long busy day. I have dealt with my sister fighting with her psycho ex boyfriend since the moment I opened my eyes. I ended up taking her to the er and she came back to my house after. Her ex showed up with one of her kids and dropped him off. They continued to fight ALL DAY LONG. Which was him calling her non stop and her cussing him out everytime. We eventually had literally 12 people in my house and I started freaking out like I couldn't breathe and the room was closing in on me so I literally cleaned and reorganized my living room while everyone was here. They just left and I'm still on edge so bad I just want to cry. I've never had an actual panic attack but I feel like I'm about to have one. Does anyone have any advice on how to deal with how I'm feeling? Any help is appreciated!