Ok, I thought I remembered saying the Asacol was a rectal med...here in the US, we all know Asacol as the oral version of mesalamine and Rowasa as the rectal. Is your Asacol an enema or suppository? If it's a suppository, I think an enema might do you more good. Also, you should probably use it every night instead of every other night...what does the prescription say for that?
If the Asacol doesn't help (after you've been using the enema form every night for a couple of weeks), then you could ask for a steroid enema or foam. I don't know what the brand names are in the UK. Your doctor should know what you're talking about if you say you'd like to try a steroid enema. If not, get a new doc!
And honestly, I'd up your pentasa as well...I mean, even at 1 pill a day you're only taking 1/4 of what your prescription is written for.
Symptoms began in November 2008, ~4 weeks after giving birth to my son.
Eased for ~3 weeks in December, possibly b/c of probiotic use?
Returned in January 2009 (with a vengeance), diagnosed with pancolitis on January 30.
Currently taking Asacol (400mg 4 pills 3x daily), Rowasa every other night, Culturelle probiotic, and Zoloft (25 mg).