I think it's inflammation as well. The inflammation could be in a small area but that is what is causing the urgency.
Perhaps I'm wrong but I wouldn't consider myself in remission if urgency was still a symptom and for me urgency was one of the last to go.
When my flare was worst it was very hard to keep rectal meds in but I kept trying and got better at keeping them in longer one try at a time.
You should really get them into your nightly routine.
In remission April 2010 after 10 years of suffering and no remission ever
Jan 2010 started SCD diet (modified to remove dairy, fruit & juices)
Bleeding stopped in 3 days, 95% remission in 5.5 months
Diet: Gluten/grain-free, fructose-free (blueberries OK), dairy free (swiss cheese OK), starch-free
I eat: Protein(meat/fish/eggs,no soy), nuts(soaked/roasted), non-starch veggies, nut-flour muffins
Daily: fish oil, Vit D3 2000 2Xday with oil/fat, veggie juice, sunflower seeds, probiotic VSL#3
homemade yogurt and some fruit OK at 5.5 month remission
Highly recommend: the book "Life without Bread" and the Specific Carbohydrate Diet