Hi again OP. I understand where you are too. It's shit and it hurts like hell. As Hellsbells says, although you say you feel like life is over, it really isn't. There will be a new life after this. But for now, there are some things you can do to get through this bit.
Get your support network strong. Do you have close friends who you trust? Choose them wisely - not those people who like a gossip, or will just tell you what they think you want to hear, but people who will really rally round and help you physically and emotionally. Do you have family support nearby? Ask for help where you need it.
You said you're struggling to eat - try to take something in, little and often. Your body needs the fuel to keep going. Keep drinking water. I ate most of my meals with my children when my ex left suddenly. Eating a child portion is better than eating nothing. If you find food makes you feel ill, try soup or broth, or porridge, or something that's easier to digest and doesn't need to be chewed.
Take each day in chunks. 10 minutes, an hour, a morning, an afternoon. Do you have times that are most difficult? Perhaps try to make them easier by talking to someone, or going for a walk, or something that you find more relaxing - a hot bath?
I remember the days were like being on a roller coaster. Please know that your feelings are all normal, and OK. Do you keep a journal? Writing about how you feel may help you to acknowledge and feel your emotions without them exploding. Journaling is a safe way to get those emotions out. If you keep them all inside, it's much harder to heal.
Be kind to yourself. This is a really shit time, and I can really hear your pain. What would your best friend say to you now? Self-care and compassion for yourself will be so important now. Talk to yourself with love, and ask how you can best support yourself right now. You sound like a lovely person, so be lovely to yourself. Maybe do an act of kindness for yourself every day - whatever makes you feel calmer and safer, do it. Buy yourself flowers, or walk in the sunshine, or lie in a bubble bath. You are worth it.
Are there areas where you can be in control of your environment? Do you have a safe place in the house where you can go, where you can feel that you are safe?
Sending love to you.