I live in Europe so you can forget about amphetamines/adderall basically, only thing you'll get here is Ritalin and even that not as easy as you might think. Modafinil is easy to get on the internet though. If I lived in the US, I would likely be on Adderall I'd guess.
It helped me so much that I wouldn't have completed studies and got my current job if I wasn't on it. I know, because I still remember the struggles I've had before (and over time learned that I am not alone, that many, many people suffer from ADHD-PI or ADHD-like symptoms and all think it's just them...).
Also, fuck everyone trying to tell people that "eat better, sleep more and do sports" will fix ADHD-PI. You should totally do all of these if you aren't already, but it's not fixing shit. Medication works.