my fiancé broke up with me after 3 years

Jackie • Hi! I`m 32 with cystic fibrosis
I feel lost, hurt and in a panic. He broke up with me on Thursday, after 3 years together. I can't sleep and I'm having trouble eating. I need help on how to get through this. If you could please give me any advice on how to get through this, I could use the help. I feel like I have lost everything 😭