Berries, i don't know what mental illnesses you have but i don't think that you can equate your reassessment now with your initial assessments from 25 yrs ago. What was assessed to be true then doesn't make it any less true if it is not found to be the case now. So many things have changed in 25yrs, the diagnostic criteria, our understanding of different mental illnesses (thank goodness!), the treatments offered....i'm betting just about everything...up to and including you has changed. You haven't wasted years and resources. Just because things change because they are categorised differently by some random medical professionals, doesn't mean everything that you have been through is a lie. It is the truth, it is your truth.
take care of yourself rather that hurting yourself further.