Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...
Let your feelings out to a counselor or journal. Write letters to her, but don't send them, of course. I think these things will help. In the meantime just keep yourself busy and find things you enjoy.
At some point, you may want to get rid of everything that reminds you of her if you can, and fill your life with the things you used to do or have before you met her. You were a complete, self-sufficient person before the relationship and you can be that again. Hang in there!