heart break- what do I do😔

I'm so broken and I don't know what to do. It's been two months and I feel so sad and not myself. He has a new girlfriend and I just don't know how to handle this. My head feels like it's going to explode. I can't sleep or eat I just feel nauseous whenever I think about it. I try to keep busy but every little tiny thing reminds me of him. My friends are no help, whenever I bring him up they say "who cares." Like obviously I do wtf. I just feel like I'm not even living, like part of me was taken away and I just really really want it back. I just so desperately want to move on and be happy again I don't know what to do