Hang in there, Tina.... don't give up. That's the important thing. Try to do something every day that brings you a little bit of happiness. A small thing.
Making life better is an art, and can be fun for it's own sake.
The best way to figure out what is to make a list of things that are missing in your life, besides a man. Then either make a goal and work towards it, or find something that fits. A hobby, or maybe doing some light weight volunteer work.
Good luck with your illness. I can't imagine.
About that guy... don't give up on him. Ages and ages ago, I met the guy of my dreams and turned him down, and then decided to be friends with him.
I was a huge flake back then, but we did see each other from time to time. I dated someone else for a while who turned out to be a BIG BIG mistake. Then, I ran into that guy again, and things just clicked. That guy is now my fiancee. And frankly, since both he and I have matured since then, we have a better relationship now than we could have back then.