A couple of common stories. SSRIs have a habit of fixing depression or revealing that isn't the only problem. I had the same experience of looking back on some wild times through a different lens after the dx. I then denied it for about 20 years until not long ago. I was using a dx of depression and ADHD because of stigma. I was re-diagnosed with the tests and history evaluation. I knew what my history meant this time and rattled off some relevant episodes, so it was pretty much confirmation of the old dx.