Mydayis and pain relief

I take mydayis, a stimulant drug for adhd generally. It's different from Adderall and s helluva lot more expensive even with insurance. Anyway.... had a weird experience. Ran out of oxycodone for various legit reasons. Took mydayis and found complete relief from pain for about 8 hours... as long as the stuff lasts in me. Had anyone else had this happen. I heard on here with Adderall that it helps the pain killer but this was no pain adjunct and it was relief on its own. Should I let my doc know to for side effect???? It was nice.