Well, in my experience once you get the ADD/ADHD diagnosis it's not exactly hard either. Clearly if you walk into the doctors office and demand a prescription it's not going to end well, but you can definitely ask to be tested for ADD/ADHD, and assuming that goes well asking about medication options should get the ball rolling.

Of course this is going to differ by country. In my case I had to try therapy first before medicating was an option they would consider, but that's hardly a show stopper in most cases. and who knows, maybe therapy is the perfect solution in your individual case.

How do they test for ADHD?

You can't exactly get a blood test for it for sure, it's pretty much diagnosed based on the symptoms at the moment.