Experience with oxy after years

Took 40mg oxycodone after like 3 yrs. Tell me why KRATOM of all things gives me more of a high. I set a timer for an hour just to see how I felt. And I know by now you’re probably thinking I took some fake pressed shit but this was from an old prescription I had and found recently. Is it because the prescription is old by any chance? Maybe the high is more subtle then I remember it being and I’ve been hyping it up to myself for years lmao