There is no way someone on 100mg methadone could feel 45mg oxycodone.
Also, 48 hours is nowhere near enough time for someone who is taking 100, oh wait, no, now he's taking 120mg methadone. I bet he can't even go 48 hours without dosing due to the withdrawals.
Not to mention this guy is also doing 3-Methylfentanyl.
We are not here to help you get high, no one here is going to tell you "OH YEAH BRO TAKE 4-6mg XANAX ON TOP OF METHADONE OR 3-MF" because that is not HR. This is an HR focus forum, this thread is purely you attempting to get high and we are not going to help you with that.
You should know the dangers of mixing opioids and benzodiazepines. Especially such potent ones like 3-MF, methadone, and alprazolam.