I know how important a diagnosis can be. Whenever I was given one, it allowed me to make sense of my experiences. Recently I had all of these diagnoses taken away from me to be replaced by nothing, and I felt uncertain and dismissed and actually very, very angry with those who had taken away my explanation/certainty.
However, I've since come to realise that what we actually gain from a diagnosis is understanding: we can look up the condition to understand it and ourselves better. However, even without a diagnosis, we can still come to understand ourselves better by examining our symptoms. So that has been what I have focused on lately; reading up about my symptoms and the stories of others with similar symptoms (whatever their actual diagnosis) and feel that I have a better understanding of myself even without a label.
I guess what I'm trying to say is that diagnosis is not important per se, it's the understanding we can get from it that matters and is what you seem to be searching for, which is obtainable without necessarily ever getting a formal diagnosis.
All the best Tower_Tusk
*Willow*