Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.

well, that's how yu feel isn't it?
You are worthy to have a friend like her. You call her back and set that appointment up and you go.
You have got to start somewhere. This is the perfect place.
Good luck and let me know how it went.
PS Friends are forever.
Since she has been such a good friend be honest with her. Honesty can also mean being honest about "there is more" but not going there. Can you tell her something like "I'm not in a very good place right now." and then say you would love to see her, but that you are not ready for getting into specifics, and that you would like to make the visit more of a diversion from things than a solving things visit.
Just a thought.