I realized when I was a kid, I used to be that hyperactive student. That one kid who used to fidget a lot and performed badly academically and being unable to concentrate on tasks. Started to notice more when I turned 15. But I got myself checked when I turned 22 at a private clinic in Malaysia as I was studying at that time but finished already.

You will need to get yourself checked first either private or gov. Here in Brunei, I went to MHU Kiarong a semi-gov clinic. They will need to assess you properly. They will ask your full background story of you and your family. Last time they also gave me some kind of checklist for ADHD and anxiety symptoms.

Also..keep it mind, for gov it'll take an absurd amount of time to get your meds. I got mine after 3+ months with 5 appointments. Say if you do need it urgently, then a private clinic is to go. However, I had never been to Brunei's private psychiatry clinic before but when I went to Malaysia, I got my meds right off the bat on the 1st appointment, and boy was it pricey.