I’ve was in my late 30’s on active duty in the military. As someone who has been in more than a decade, I still couldn’t remember all my uniform pieces on workout days.
When I spoke to my doctor, he referred me of base for testing. There testing was fairly straight forward. There was some testing for learning disabilities and IQ. Mostly written work, but half was doing a rather long computer questionnaire. When I took the test for the ADHD it was a particularly bad day. Apparently the psychiatrist had seen 3rd graders with worse scores. I think she thought I threw the test. When the testing concluded I got the results and went back to base for the rest of the treatment.
I don’t know your circumstances, but I would advise simply asking your doctor for a referral. They did check for other disabilities, and also other contributing conditions, like depression. Getting treatment started with a few different drugs in very small doses. My biochemistry muddy be off because I had significant reactions to those small doses, but just communicating was able to solve it all. There was even one that made me not want sleep anymore. On day 2, I called and they made me stop immediately (given that is pushing deadly if it continued). So definitely don’t think it’s all smooth sailing.
On the far side of that wall now it’s amazing though. I can read again and play video games again for longer than a simple phone game. Once you figure out the right balance for your body chemistry, you’ll be amazed you managed without it.