My boyfriend of four years broke up with me. Not coping

Hi, my boyfriend of four years broke up with me two weeks ago. It was completely out of the blue. iI had to leave my house, my friends and the life that i knew. We ended up sleeping together everyday for the next week. On the saturday he said this could be the last time and when i asked if he had met someone else he said no so we still had sex. It turns out that the next day he took out a girl that he had met in a pub just three days after breaking up with me. It broke my heart all over again. This is when things started to add up in my head about his trips to the pub every night, ignoring my phone calls, lying who he is going out with. He said he didnt know the girl before we broke up but i dont believe him. Now all i can think about is him with her, what she is like comparing her to me. He has told me all of his family hated me and his friends are laughing at me, i was an embaressment to him. He said i was nothing before i met him, just a stupid slag when i hadnt even slept with any one else. It hurts so much that he has moved on already. I cant eat and have loast a stone in two weeks. I cry all of the time and have no passion for anythign any more, i wake up sahkign and being sick. I am exhausted and feel i have no one to turn to but him.
Im scared this will last and i feel sick at the thought of him with someone else so soon, in my house, my bed. It feels like he has ripped all of my future and dreams away and given them to someone else.
PLease help me i dont know what to do