Hi..welcome to the forum!
It sounds more like CD rather than UC considering you don't have a consistent inflammation pattern.....colitis is a clinical term for inflammation in the colon....but there are other "colitis" that can mimic either such as microscopic colitis or c.diff..etc.
The biopsies should lean toward or exclude possibilities. I do hope that you'll be able to get a definitive diagnosis.
The Lialda should help get some of the inflammation down and help with your symptoms.
Looking forward to hearing the results of your biopsies...please keep us posted.
Hope you start feeling better soon.
*Heather* Status..Asacol (3 x2 daily); Salofalk enemas nightly for flares, tapered to maintenance mild flare nightly enemas
~diagnosed January 1989 UC (proctosigmoiditis)
~Bentylol (dicyclomine) 20mg as needed; Ranitidine (reflux); Effexor XR 75mg(depression); Pulmicort/Airomir (asthma)
~vitamins/minerals/supplements; Probiotics....(Natural Factors Protec, Primadophilus Reuteri Pearls, Natural Factors Ultimate). @ bedtime
~various digestive enzymes as needed; started Omega 3
~URSO for PSC (or PBC) 500mg X 2 daily (LFTs back to NORMAL!!)
My doc's logic.. "TREAT (FROM)BOTH ENDS" worth it !!!