Hi Ellensue,
I'm so sorry you're going through such a tough time. I went through a similar experience a few years ago with a guy I dated for 4 years. He was my rock and when we broke up I fell apart. This happens. Don't ever think you shouldn't feel how you feel -- it's part of the grieving process and you need to deal with it in your own way.
I will tell you that it will get better. It may take a little time, it may take a long time. But you will feel better. I agree with the others who suggest finding something to fill your time and distract your mind -- work or volunteer work. Volunteer work with animals helped me a lot and I always feel comforted by animals (but that's just me, you will find something that works for you).
I also felt (and still do, sometimes) that my close friends and family were unable to help with the situation -- often because they are too close to the situation to offer objective advice, or because they offer advice when I just needed someone to listen to me. I too found support in unlikely places, so I'm glad you're here.
I hope we at PC can help you