What's happening to you isn't fair and I know it stings. The truth is that anyone can fall ill. Mental health conditions don't discriminate. The good news is that many people recover. Yes, I believe with the right help and your loving family that you will get better.
Seeing a psychologist is an exercise of hope and trust and it's good that you're asking questions. In my opinion, the most important thing is to find the right one. Someone you feel comfortable talking to and who is offering you the treatment you need. BB has some questions on its website that you can ask when you meet the psychologist and then you can decide if it's the right person for you.
Psychologists operate in different ways. However, you should be able to talk to the doctor and set the "rules" around privacy together. In our case, my daughter's sessions were private. If they had something to share that, would help me to help my daughter, I was invited in for the last ten minutes. If I wanted to talk to the doctor and they both agreed, I could ask to join them for the last ten minutes. If wanted to talk to the psychologist alone, I always asked my daughter first and told her what I wanted to discuss so she wasn't blindsided.
The psychologist never divulged private information, she would talk to me in generalities. To this day, I only know the details my daughter wanted me to know and that's okay because I was getting the information I needed to help her. My daughter had her privacy, she never felt betrayed by her doctor or me and she had my best support. The only exception to the rules was if the doctor or I thought my daughter was in danger.
You are older than my daughter was at the start and I don't know how far you want to involve mum, so your rules may be different. That's fine. The point is that you get a say.
You have to try working with a psychologist and taking medication to start learning what will work for you. It's a very individual thing. There can be a bit of trial and error. I encourage you to follow the medical advice you are given and try and be prepared to change course, if required.
For us, a combination of medication, CBT, a very good paediatrician and a capable GP were required. Your journey may be different, it doesn't matter as long as it gets you where you need to go.
Does this make sense to you?