Hey Eli,
Everything that Charlie said I agree with. I actually just went through this with my partner. I was noticing behaviours with him that were frustrating for both him and me and recommended bringing it up with his family doctor. They did some of the assessments that you can
find here.
While I don't recommend going to your psychiatrist and being like "here's the assessments I found on the internet and used to diagnose myself" I do recommend doing them yourself and pinpointing the areas that you find that you have the most difficulty. That will allow you to go into your appointment with a clear idea of the areas that you need to emphasize and you can prepare to have examples of how each of those areas of functioning are impaired, having a negative effect on your quality of life/relationships, etc.
Additionally, this
youtube channel has amazing information on ADHD and was helpful for my partner.
If you ever need to talk, feel free to send me a message on discord, while I don't have the direct experience of having ADHD, I just went through, and am still going through in a lot of ways, all this with my partner so I may have some insight. I hope all goes well at your appointment.