Are the BMs solid? Liquid stools could be overflow diarrhoea making their way past impacted stool in the colon.
You mentioned UC. Is there any doubt about
your diagnosis between Crohn's and UC? 'Cos Crohn's typically tends to affect the right side of the colon worse than the left side and vice versa with UC. But there are always exceptions to every rule.
Could consider trying enemas in the meantime. They're not fun, but they do reach the left side of the colon very effectively. Mesalazine is useless for most types of Crohn's; steroid enemas may be better.
Dx Crohn's in June 2000. (Yay )
Tried: 5-ASAs, azathioprine, 6MP, Remicade, methotrexate, Humira, diets.
1st surgery 20/2/13 - subtotal colectomy with end ileostomy.
2nd surgery 10/7/15 - ileorectal anastomosis. Stoma reversed and ileum connected to the rectum.
Current status: Chronic flare. Do I have any other kind?
Current meds: 50mg 6MP; Entyvio (started 3/11/16)