Dave, ****HUGS****
I am so sorry that things are really messed up right now. I know how special she is to you.
You expressed your thoughts and feelings so well. Can you possibly do this with her? If she loves you (and I think she does) she may be able to help you through all of this. It's always better if the person you care about at least understands why certain things affect you in a certain way.
Please don't give up. You have a lot to offer as a human being, and I'm sure she knows it. Trust her. Let her know what she means to you and why you're reacting as you have.
Many, many ***HUGS**** You know we're all rooting for you.