Hello,
We (son and I ) are pretty new to all this but I would firstly say that I think that being on entecort for a week isn't very long at all for it to take affect(believe it can take a few weeks for it to kick in) but as indicated it is not regarded as a long term solution.It does appear to be fairly normal to then move onto something else-son put on entecort January, now in his final few weeks of tapering off of it. Approx 6 weeks ago he went onto azathioprine(immuran). I can fully understand your apprehension about taking these drugs but I think that after you have been on them a while it just becomes part of the 'norm'
Your symptoms appear to be similar to my son's mild cramping and no diarrhea!
If you go onto the Immuran just remember to keep having the blood tests-especially in the first few weeks(son has had one per week for past 5 weeks)
Without taking something then you could very well end up flaring again.
Good Luck