hey guys. so ive been an opiate abuser for about 4 months now. my tolerance is at 90mg oxycodone 3x a day. lately when i dose, i feel high for like an hour, then as soon as an hour is up or sometimes up to 4 hours later get extremely nauseous and dizzy, often throwing up. is this overdose? i barely even feel euphoria, minor sedation (3 or 4 nods is alot for me) and its so long after i dose that i should have felt an overdose by then (i sniff them), but those are definitely the symptoms. also, at the 6 hour mark, i feel chest tightness, almost like i cant breathe. could this also be overdose, or more likely anxiety? this is a higher dose than ive ever been at and i just want to be sure. thanks