I had anxiety as adderall was winding down, maybe 15-20 minutes. When the doctor had me try an extended release version the only thing that extended was the anxiety! to the tune of about 2 hours!
I don’t know where you are in your medication journey, when I was switched to ritalin the anxiety reaction stopped completely, so it’s possible you are on the wrong stimulant for you. It can also be an issue with the generic formulation.