My experience with doctors is very negative. Maybe it's because we are (Poland) somewhat behind 1st world.
Most doctors assumed everything is ok because I was doing well when it comes to money (I was lucky to find a profession I was very good at despite disorganized lifestyle and putting not so many hours into it) and treated me like someone who makes stuff up. I tried psychiatrists, psychologists, neurologists. I even suspected something might be wrong with hormones so did all the tests/check-ups.
No doctor even suggested I might try diet change/drugs/supplements for my problems.
From what I read it's different in US and other countries where it's easier to find a doctor who try to help you. It was hopeless undertaking here and I wasted too many years trying (most doctors here don't even believe something like adult ADHD/ADD exists let alont other "made up" problems which according to many "comes from bad upgringing and lack of discipline").
100mg in the morning although some of my friends take 200mg. 100mg is enough for me to keep me awake/motivated/focused to about 4-5pm; rest of the day is ok as well and I usually sleep very well after that (interestingly I need less hours of sleep having taken modafinil in the morning).
Depending on country you can get it from various sources in some (UK for example) you can just order it from India 100% legally. In US it's more of a problem but people still get it. Try reddit/r/nootropics for a start (and recommended places to get it). I also like /r/ADHD for community/support.
Please consider what I wrote as personal very subjective testimonal and in no way an advice, let alone medical. If you decide to take any drugs please at least read about possible negative effects/precautions you should take.
