As someone who takes an ADHD medication, I find the idea of a drug shortage terrifying. Life gets so, so much harder when I'm unmedicated.
It's like the difference between walking on a sidewalk and walking in sucking mud, with stuff falling out of your pockets you have to keep going back to find. You build a life that's only possible thanks to your ability to walk on sidewalks. If you suddenly find you can only get around by walking through mud, even with a huge amount of will power, you're going to watch your life fall apart as you just can't keep up the pace of your old life.