I am sorry to hear what you are going through. It can be really tough. From my experience of being dumped from a 7 year relationship in the middle of my worst anxiety I can relate. I can tell you that things will definitely get better. Life can get so good again. You just have to go through the not so fun part you are at right now.
One thing I suggest is that you allow yourself to feel your emotions and go through them. Don't try to deny them or push them down or you will just prolong the pain and probably be more anxious. So if you are sad, then feel sad; cry, punch pillows, scream into pillows. Do what you feel is right. Feel what you need to.
In the meantime please try and eat and exercise. It will help so much. Even if you just eat small snacks throughout the day and exercise in small bursts. And please don't turn to alcohol or drugs to numb the pain. That will NOT work in the long term and will only serve to mess things up more.
Please keep me posted on how you are doing. You can and WILL get through this and you will be just fine