I found that my side effects got better with time, but also i ended up taking other meds (prozac) to balance me out, especially with the anxiety and lack of appetite/feeling tired.
I’m not on adderal anymore (they don’t have it in the EU), I switched to vyvanse a couple years ago, and I find that the side effects are way milder. I’d say it’s not quite as effective as adderal, but I can take it every day (weekends too) without feeling like I’m on crack.
I have found in my experience that yes weed worsens my ADHD. However I’ve never been drug tested for it by my doctor. The only justifiable reason I could imagine would be if they put you on a medication where there are known drug interactions, or something, but even then it seems a bit odd to me. It sounds like this is an atmosphere that comes from their substance abuse specialization.