Almost any mentally disturbed person feels a unique case. I hope you can get some answer from the docs. You should ask them clearly to start ruling out possiblities at least...
Obviously being assertive in your conditions can be impossible. Next time you meet the doc make sure you are with someone who will ask the right questions.

It seems to me very hard that a simple SNRI like Cymbalta can knock you down like that. Our mind, at the opposite, can produce ANY symptom.

The best of luck