Hi Natalie, welcome!
My first thought is that you may have pouchitis. Pouchitis can have a variety of symptoms, some of which can be pretty vague, but the urgency, getting up frequently in the night and the aching in the lower abdominal area do sound like pouchitis symptoms and therefore pouchitis would need to be ruled out. Not to mention, it's best to treat pouchitis sooner rather than later, as a simmering case can become worse if left alone. I know it may be difficult to see a doctor since you are away from your regular physician (I assume you had your surgery in the UK), but you do need to find a gastro who is familiar with pouch issues and go from there. A GP would not be ideal as most of them have limited (if any) knowledge on the pouch, but if you cannot find anyone else, you may need to see a GP first who can then refer you to a GI.
Best of luck!