Why did my psychiatrist not tell me that she believed I had a mood disorder

Hello, I’ve been seeing a psychiatrist for about 5 years now for generalized anxiety disorder and adhd. Well I’ve been in a hypo manic state for about 4 months and I finally couldn’t take not sleeping and become very paranoid so I contacted my psychiatrist to see if she had an earlier appointment and explained to the receptionist that I only sleep a few hours if that at night and my paranoia and anxiety had drastically worsened. She couldn’t find any sooner appointments for me. That same day I saw my therapist and she told me to call them back and tell them that I also am full of energy and tell them that I’m in a hypo manic state. I did and she was able to magically see me the next day. The next day I asked my psychiatrist what exactly is wrong with me because as far as I’ve been told I only had anxiety and ADHD. She finally told me that she had it written down that I have a mood disorder. Shes never mentioned to me before! She said she was going to write in my chart that I have bipolar 2. If I didn’t ask she wouldn’t have told me she was ending the session when I asked. So why would you not tell someone what illness they have but still prescribe medication for it? And also why did she only listen to my concerns about paranoia and not sleeping when I mentioned my therapist wanted me to tell them? Mind you I’ve been dealing with these symptoms for years depression episodes and the manic episodes. This is the worse I’ve been so far. Thank you in advance for any replies.