Oh dear. You poor thing. Have some
and(hugs)
A few years ago, I split up with a man I loved deeply, and had loved since I was a teenager. We had DCs together. When we broke up, I thought I would die, and it's no exaggeration. I really thought I would. I was in mental and physical pain, could not stop crying day after day, week after week, could barely function enough to go to the shops or anything. The pain got so bad I did want to die, and I panicked when I had to go out. Even surrounded with friends I felt in pain. I couldn't talk to anyone. Truth is, no one understood what I was going through. No one. It was hell.
Weeks passed, then months, I threw myself into a new hobby gardening, which was really strange as I had hated it before, but it really helped.
So since then, I've got past the pain, I'm still alive, and I've come to understand a few things about break ups. Firstly they affect everyone differently. Some find it difficult for a few weeks but can still function. Some people don't allow themselves to feel uncomfortable for long and throw themselves straight into another relationship.
And some people suffer from more acute emotional and mental trauma. If it continues for a few months and you start thinking suicidally, you must take yourself off to the doctors. You are suffering from depression and they will probably give you a very small dose of anti-depressant that will dull the feelings a little and help you to move to coping with things better, and remove some of the anxiety.
One more thing. I realised that my severe reaction was also to do with my abusive past (no confidence etc) I had put so much trust in my partner, I had loved him in an unhealthy way. In other words, I allowed my ego (the thing you need when you're single, that serves as your sense of self) to completely die when I was with my ex. It took a lot of time to get it back. And now I am much better able to love someone without losing myself, as I did with my ex.
Also you need to read good books that will help kick start you to thinking more healthily. I'll do a list of the ones that have helped me in a mo.
You can and will get through it. Go to the doctors!