Dumped and Defeated

My boyfriend, well ex, and I broke up yesterday. I'm just so broken up about it and his willingness to throw it all away. I can't sleep or concentrate, I have outrageous migraines, and I can't rreakly hold a conversation with anybody without beginning to break down and cry. It just hurts so much. I've been in this situation before with previous relationships so I know it gets better but for right now, it absolutely sucks and I'm broken. So many "what ifs" in my head and unanswered questions.