I think finding the right temperament for you is most important, although of course someone who just doesn't have control of their emotions such as anger would likely not be a good fit for anyone. I find I need calm, compassionate therapists and psychiatrists who are also very open with me and direct. I believe this is because of some issues from my past with family members that had some emotional regulation and anger problems, and getting picked on by others growing up. I also have a lot of anxiety. So, someone who has that calming effect on me and who is compassionate to even out my not so great levels of self compassion is ideal for me. I think someone else might find they need a different kind of temperment from a therapist, and that's okay, too.

As I am not a therapist I will just say my opinion, but this is not any sort of advice of course. I think therapists have emotions, and they might sometimes feel angry, but they need to be aware of how that affects the client and how they express, or choose not to express that anger to them. If it would be harmful to the client or is in no way relevant or helpful, maybe they need to process it on their own time and try not to let it come out in any major way during the session. If it is a justified feeling of anger towards a specific situation, and it would somehow help the client and relationship to bring it up or express it in a healthy way, then maybe they could choose to do that. Anger doesn't have to be a bad thing, but it doesn't really sound like your past therapist was helpful or dealing with in ways that were healthy for you. I hope you are able to find a great therapist to help you.