Hi Chloe..welcome to the forum!
I would probably pass on the trip to Asia...at least for the learning phase. If it's not already booked.
Did the doctor take lots of stool samples to make sure nothing else is going on? There are some gastro bugs that can mimic UC.
I would strongly suggest a probiotic. One that could suit your needs of travelling would be Bio-Pro which a few on here recently started to take. It doesn't require refrigeration and the strains it contains are very beneficial to IBDers.
You should also consider to add Primadophilis Reuteri for a while....also excellent, but not good for travelling.
You've got lots of options available and know it takes a while for it all to get sorted out.
I think this is an excellent place for you to be...not all of us are in a dire situation. Lots of us don't relate health-wise to all members' postings.
It's good to be in the know...but you have to keep things in perspective as to what your husbands situation is.
You're an awesome support for your husband....that in itself will work wonders!
Keep us posted as to how he's doing.