It sounds like you were taking short-acting Adderall. Yes, there’s quite a crash with short-acting — it dumps all the medication in your system at one time and wears off pretty harshly. You might well do better on the time-release version (XR).
There are two types of stimulants: amphetamine (Adderall, Vyvanse, Evekeo…) and methylphenidate (Ritalin, Concerta, Quillivant…). Almost everyone does well on one type or the other, but not both. Consider which type you had the best symptom relief with.
Also, the standard of care for prescribing stimulant medication for ADHD is to start at the lowest dose and only increase if and when needed. You were not started on the lowest dose of Concerta, but the 3rd step up (18mg, 27 mg, 36 mg, and 54 mg are the doses).
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism