Emotions

I can't eat,I can't sleep,barley can keep down water. My boyfriend for almost 2 months left me yesterday, I know its not long but he was my best friend I told him everything. He won't text me or call me back,blocked me on Facebook and Snapchat. I just want answers and closure, what do I do? I gave back his sweatshirt and knife back today but not the necklace he gave me for Christmas I can't let go all the way yet.