Perhaps you are subconsciously picking up subtle cues from your therapist that is raising some sort of red flag that they are dismissing you or invalidating your experience of what you are going thru? If a doctor is genuine in wanting to care for you, you will usually feel more at ease about opening up. But, if there is any kind of block there, you might be very well picking that up.

I could be wrong. I don't know. All I know is with my experience, especially the last couple times I reached out for help, the docs were quite dismissing. It made me feel utterly stupid for feeling the things I was going thru.

Trust your gut and don't be afraid to change doctors if need be. You need to be heard and validated and taken seriously.