I can understand how frustrating this has been for you. From what you've described, it's definitely worth getting evaluated for adult ADHD, but there isn't a single test that confirms the diagnosis. An experienced psychiatrist will take a detailed history of your symptoms, including whether they were present since childhood, and assess how they're affecting your daily life. They will also rule out other conditions like anxiety, depression, or sleep problems that can cause similar symptoms.
Next Steps
Please don't worry about having to "convince" the doctor. A good psychiatrist will listen to your concerns and guide you through the evaluation. If ADHD is diagnosed, there are effective treatment options that can make a significant difference. I would encourage you to go ahead with the assessment rather than delaying it further.