Withdrawal from switching vyvanse to adderall XR

I was at vyvanse 30 mg for months and switched to adderall XR 15 mg because of the price difference. I’ve had withdrawals from other meds before and they mimic a cold/flu. Has anyone experienced a withdrawal effect from switching stimulants?

I didn’t take anything yesterday because I woke up late and started my adderall today. Both days I haven’t felt too great. No fever, but i definitely don’t feel good.

I also feel like the vyvanse 30 mg was stronger than the adderall 15 mg. I’m not able to do as much on the adderall and it makes me really tired really quick. My prescriber told me it’s the same 8hrs but the adderall almost feels like it’s only 5 or 6.