I'm coming up to a year post takedown and I still have problems with this. I find it helps if I don't eat for a few hours before going to bed. Also if you aren't already try something like immodium

Traveling tend to disrupt our diets, stress levels, bathroom availability, bed times, etc. Each of us varies in how resilient we are when these things are messed with. It's also possible that you've developed a touch of pouchitis, but I wouldn't start out assuming that. You might even have Traveler's Diarrhea.

You don't say what you're already doing, so I don't know what to suggest adding/changing.

Leakage could be normal recovery, or could be pouchitis. Docs don't like to assume pouchitis this soon after surgery. The stapler they use for the ileal-anal anastomoses is big, so sometimes the stretching of things takes to me to get back to normal.

As for the itching... determine if the itch is inside or outside the anal canal. If inside, I'm sorry to say you need to get some medicine up in there. I did this for months using Gold Bond Anti-Itch ointment (OTC). Anything with menthol and/or lidocaine will help. Nupercainal is another OTC option. The menthol is quite alarming at first, but the relief from the itch is well worth it

Steve