Grrrr… I hate hearing this sort of thing. Dismissive doctors with glib throwaways, instead of digging deeper to find causes rather than just ticking the box for symptoms.
I’m not saying that you definitely have ADHD, but your symptoms surely deserve to be investigated.
I was similar. I didn’t know much about ADHD, and never considered it for myself. I would give my own diagnosis to the doctor, and then Hey Presto! I’d be on antidepressants.
I didn’t find out about ADHD until a couple of years ago at age 49. I found it myself, not any of the countless professionals I’d seen before. They had never shown any interest at all in underlying causes when I asked them to look.
Maybe try contacting people in your area with ADHD, and asking them if they can recommend someone who knows what they are talking about whe it comes to ADHD.
Otherwise, just keep forking out your money until you can get somebody who is able to do the job you pay them for.
You may or may not have ADHD, I don’t know you and I’m not qualified. But glib brush offs don’t help anybody.
Your own observations about yourself can give you an idea, and obviously ADHD is something that rings true with you.
Others have posted good advice here, such as make a list of the symptoms you have, and examples of the behaviour and situations which make you suspect ADHD as the cause.
Do as much homework as you can, research ADHD.
But also go in there with a blank slate, and be prepared to accept a doctor’s advice f it feels right.
If it doesn’t feel right, or if you think they are missing huge chunks of knowledge, logic, or reality, then keep moving until you find someone who has those qualities.
Good luck! You’re not alone, there have been plenty others exactly where you are now.