Midwest US. If I felt like they were good at what they're for, I would probably use them more. My experiences have been bad. We're veering quite a bit off-topic here, but the last time I went to a doctor it was because I was shitting blood. I figured it was probably hemorrhoids based on googling, but was worried of an off-chance of cancer and decided to get it checked out. They had me collect a stool sample and come back two weeks later. I did, and the first thing they did was throw the sample away without examining it -- they said they shouldn't have even asked for me to collect a stool sample to begin with and apologized. Cool doc, thanks for having me scoop my shit into a cup for no reason. Then they charged me ~$300, had me get naked, and the doctor asked why I wasn't circumcised without me bringing it up and encouraged me to get circumcised multiple times (in my 20s) while I repeatedly said I wasn't interested and that it's supposed to harm sensitivity, and then he finally proceeded to stick a camera up my ass. The results were ultimately inconclusive, he said it was probably hemorrhoids but that he couldn't see them with the camera and verify that. So I'm out ~$300, my collecting-my-own-shit-in-a-little-cup virginity, my arguing-with-a-doctor-about-circumcision virginity, and my having-a-camera-shoved-up-my-ass virginity, and I don't know anything more than my free google searches told me two weeks earlier. 0/10, would not visit again. YMMV.
No, it's not lost on me that I admitted to previously consuming 3/4 of a gallon of Monster a day two comments ago and now I'm posting about shitting blood, but I think there were other contributing factors (notably bad lifting technique).
Edit: More on topic, if I don't care about the yes/no checkbox of whether they think I have "ADHD," and I don't want to get on the medication (which I've tried, informally researched, and made a fairly informed decision about), what can professional advice provide me that internet research about symptoms and ways of coping with them can't?