Effects - Opiates just don't work for SWIM

[Waste]

And it's getting pretty annoying

Kratom - tried it in varying doses / strains, every time it leaves swim feeling slightly warm for 20 minutes before throwing up, or just feeling so ill that he can't do anything but lie down for the rest of the day.

poppy pod tea - SWIM thinks this might have been due to too low a dose, but again, very little efects other than slight nausia

tramadol - tried it once so far (plenty more with him ), 250 or 300mg, he forgets which. Nothing to write home about, felt a bit of a buzz for a while, but again some nausia

oxycontin - Tried his largest dose last night, probably around 30-40mg crunched up and eaten on a pretty empty stomach. He even downed a cup of ginger tea to help the nausia.
It felt ok, pretty faded, felt nice just lieing in bed and watching TV, kept nodding in and out of conciousness.
However the day after it always leaves him with the worst hangover ever, he literally can't stand up without feeling sick before 1-2pm, and can't eat until that evening.

So he's asking, is this it? Even the OC was a bit of a let down, as bad as it sounds, after watching films like Trainspotting and hearing all the stories, he wants something that he can really feel. Not a mild buzz, not a "oh SWIM feels pretty warm and this blanket feels nice", something real.

Any thoughts on this situation? Any info at all really