It's probably too soon off the pred. to tell if you're lack of symptoms has been due to humira or the pred. Hoping it's the humira! Until my 7th entyvio infusion (which are 8 weeks apart after the 3 loading doses), I was having slight breakthrough symptoms as it got closer to the next infusion date. I used uceris foam and canasa suppositories during those times. Now that I'm mostly symptom free, I still am using canasa suppositories as the last colonoscopy biopsy in Sept. showed an area of microscopic active colitis. Dang colons take a LONG time to heal, plus I would imagine that whatever is causing the UC is still happening, but the meds are fighting against the symptoms only, not the cause, so seems reasonable to say that there's always ongoing stuff of some kind going on in there.
Wishing you luck, and seconding the adding of an antidepressant. I went on zoloft during the last flare because I was so depressed about dealing with UC and all its symptoms.
UC pancolitis DX March 2016, Partial Colectomy for diverticulitis Sept 2014
Apriso .375 g x 4/day, Canasa & Uceris foam as needed
Supplements: Zinc, L-glutamine, Probiotics: Reuteri pearls, VSL #3, Folic Acid, CoQ10, turmeric, boswellia, milk thistle, NAC, reservatol, colostrum, glycine
Started Entyvio 3/29/17 (Constant flares since March 2016 only relieved by Prednisone)