Generally GBP works better by taking small frequent doses throughout the day (300-1200mg every couple hours) along with a small snack (like a cracker with a piece of cheese, something with a little protein and sodium). Even with massive doses you're likely to need to dose 2-3 times a day to achieve desirably effects. Yes, tolerance to GBP builds super quickly, but it will still be doing it's job helping to prevent anxiety and RLS even if it doesn't produce the same obvious, subjective effects on day fourteen as it did day two or three.
Generally speaking though, for someone with your kind of opioid habit it will take more than GBP along to be comfortable throughout the acute detox. With the addition of buprenorphine, clonidine and a longer acting benzo such as diazepam for 10-14 days you would be golden. Even just the addition of one or two of those medications would make a big improvement over GBP alone.
It will have been helpful to have tapered a little bit, but a 10mg/day taper off 60mg is not going to make as much difference as more robust six month taper would have (obviously). You six day taper coming off 60mg of methadone will be significantly easier than cold turkey off 140mg, but it will still be quite challenging - particularly if all you're working with is GBP. That said, you should be getting a good idea of how bad it is going to be around now.
Most people I hear from seem to end up wanting to relapse most around day five, with the restlessness, depression and agitation generally beginning to taper off slowly shortly thereafter, clearing up around the end of week two. Given how you got off this your recent habit, it may take a bit longer, but even then you should be feeling remarkably better at the two week point.
That is great you don't have to hide this from the people around you. I take it they are supportive of what you're doing? That is so much more than most people seem to have who come off methadone, you're already ahead of the game.
