It is a very real thing that I have to believe most sufferers of IBD (and even IBS) go through. Check this out for reading on how the brain is connected to the gut: http://www.hopkinsmedicine.org/health/healthy_aging/healthy_body/the-brain-gut-connection
I had a flare in 2010 that lasted 4 months because of a lack of insurance. Once I got on medication and leveled out, I had about
a week before flying to the Middle East. Let's just say I was thinking the trip was impossible. But I went, and saw that I could keep myself not just alive, but maintain my disease farrrrrrr away from my comfort zone.
I know your travel story involved a flare, so mine is not a good parallel. But what I learned on my trip and have carried with me, reinforced and learned since this experience is that we are in control of our thoughts and bodies. I lose sight of this sometimes, and found myself seeing a psychologist for a few years to go over thought mechanisms to help me not dwell on my IBD/UC. A conclusion he helped me arrive at was: we cannot control the first thought to pop in our heads. What we CAN control, however, is every thought that follows. So if you find yourself worrying to the point of perhaps making yourself sick, my experienced advice would be to do everything in your power to divert your attention from whatever thought led you to this and consider other, irrelevant or otherwise positive outcomes.
I became someone who exercises every day, when I previously couldn't have cared less. It felt great to be able to be in control of my physical fitness and I started liking the way I looked and felt more and more as time went on. This has become my reality for the past 7 years, and will continue to be until I physically am no longer able to. I've learned lots of discipline as a result of helping myself get through life with IBD. The way you deal with one thing can, often, be applied to other areas of your life and that's what taking care of myself taught me. I am confident in saying my desire to get well made me a better person.
Even when I'm flaring, I keep thinking about
how the next hour/day/week will be better and I'll get back to life. I wake up in the mornings and assume things are going to be normal and try my best, at all times - healthy or sick, to stay in control.
So to answer your question: you are far from alone. This community is here for you and there are great mental health professionals who can guide you toward not allowing your UC to define yourself. You've got your whole life ahead of you, and most of it will be better than it was when you flared overseas. I promise. Good luck and don't hesitate to ask more questions - most everyone here is happy to help