Maybe a good pdoc can make sure you get the stimulants you need to be productive.
I do not take dexamp or adderall Usually it ends up going down a rabit hole Like the overuse of any tolerant/abusive drug ie. benzo's but a decent pdoc that has been rxing / calling etc.them to your pharmacy should strong arm them.

I say that as I have been with the same pdoc for a long time and he will straighten things out quickly with text from me. As far as shortages, I have no idea since I am not on one in the stimulant category.
There are a lot of pharmacists out there that like to play god or have act like they have the powers of a clinical doctor. Sorry, but there are a lot of good pharmacists that try not to deny a direct pdocs orders.
If you need more help as far as a pdoc is concerned I live in Denver, CO and the pdoc I have used for years specializes in psychotherapy, and is a great caring pdoc all around.