I've had various episodes of hemoptysis over the past 3 years. I'm 48 now. The first massive episode, which my Dr. defines as more than 8 oz., required embolization. The description by jricci was spot on. I had to stay in the hospital for 3 days, b/c of fever and terrible headache that developed after the procedure. The Dr. said it was my body's reaction to tissue dying.
I've had subsequent episodes, but have learned to live with them. I do best if I limit my vest, hyper-saline, and exercise until no sign of blood for 2 or 3 days. My husband makes me act like I'm in the hospital and rest a lot

I've been free from episodes for about 6 months now. I've limited my vest and hyper-saline to once a day. I'm not sure if this has been the key, or if it's coincidence, but it's working.
Also, I get the 5 mg vitamin K from Amazon. Make sure it's 5 mg and not mcg. I take this during periods where I'm having a lot of bleeding. Good luck, and I hope you don't have to deal with this long term. It can be very scary, but once you get used to it, it's not. Even my massive episodes reside quickly. The aftermath is gross and takes a week or two to clear up (brownish/black sputum for a while), so don't let that freak you out.