I understand the restrictions in your country, but also know that there are ways around it. Go directly back to the psychiatrist, show him or her the results of your tests, and explain the problems and that the diagnosis doesn’t match your symptoms. Be vigilant about this. Let the psychiatris know you need something more.
I would also return to the CBT people. Get them involved with your solution. Use the professionals you have worked with because they can be the most directly helpful. They need to know that what they have tried hasn’t worked. Get them involved with the correction.
At the same time I would make an appointment with the GP. Call every day until the letter comes. This is your life, and you need to advocate for yourself. Don’t wait. Start your campaign today.
Don’t engage in this as a passive exercise. This is your life, and sometimes professionals need to be reengaged in the healing process.