What I have been told by a family member who worked in mental health for many years, is that there's every chance different providers will give you different diagnosis. At the end of the day it comes down to each individual provider's decision-making and how they think they can best treat your symptoms (and bill your insurance). Go to a different provider, and they might diagnose you with something different. Frustratingly, a lot of conditions have symptom overlap, people can get misdiagnosed, and the brief amount of time you typically spend with a psychiatrist can make an impact too.

The important thing is your doctor is supposed to listen to you and work with you and if you feel you've been misdiagnosed, you have a right to discuss that and be heard by your doctor. Even if you feel you're correctly diagnosed, these are all questions you have every right to ask both your therapist and psychiatrist. You deserve an explanation of why they feel you have these illnesses. One of the ways I realized my ex-psychiatrist was full of crap was that he hemmed and hawed when I challenged him on a particular diagnosis he gave me.

I'm sorry you feel terrible. The thing to remember, I have found, is you are not a different person after the diagnosis than you were before. You're the same person, with the same problems, and the same good qualities, and you're still valid and deserve kindness, respect, and good things in life.