Ola!

I understand that you are going through a process of recovery, which is not easy because you will probably have to go through your previous experiences, and no matter who is listening to you he/she will have a limited capability to understand all of your feelings, I guess this is due to the limited ability of empathy in humans to entirely understand what is going on...to get to the point, I know that you feel disappointed how your T has dismissed you, but shouldn't that be a good thing? If he/she doesn't understand you maybe this will be a chance to come across somebody better???
I believe that psychology and psychiatry have moved way beyond the straight forward "chuck them in the bin" approach... Modern therapy tends to be a bit more advanced these days...
Also, in regards opening to different ppl, I know it's hard (I know from my experience), but fortunately, you are not the only person that they will talk to and T's are probably de-sensitized from the cases they hear on a daily basis...

Hops so that you will leap over this obstacle soon...we're here to listen with the max empathy you can get ;-)