Hi Finally,
Sounds like you are off to a great start.
Have you thought of Imodium for the upset stomach? It was a miracle for me when things were bad. The sweats/aching I just had to get through and although not nice, they were a good reminder as to why I was doing this. You have cut down an awful lot in one go. I see why you are doing this and hopefully it doesn’t put you off.
Not sure what to suggest about DHC and travel. Its a worry for sure but hopefully over this week your body will become accustomed to less codeine over the week.
Hang in there, life really does get better even though sometimes it feels it won’t xx