E_Rose..welcome to the forum!
Well, what you're describing are actually "classic" early flare symptoms..low in the rectum inflammation.
You could wait until it gets worse, but the fact that you were actually maintaining a status quo in the past says it was working.
Inflammation doesn't spontaneously erupt...it's a process, and for some, symptoms are obvious, others not.
UC can go into a remission where many are able to go off their meds....only to go back on when they flare. The only "problem" is that there can be a consistent creeping of mild inflammation upward that doesn't have many symptoms until there are some and eventually consistent where the UCer seeks treatment...sometimes to have the entire colon affected.
I've used Asacol and Salofalk retention enemas for over 20 years, I increase the enemas during flares and taper for maintenance. So far, so good...so really, look at the long-term and what they "can" do for you now rather than having them being able to do nothing for you in the future.
In saying that...not all can use 5ASA meds...but it seems you've had success...hopefully, you'll listen to your body (and early symptoms) and start the meds sooner than later.
*Heather* Status: maintenance Asacol 6 daily + Salofalk enemas every 3rd night
~diagnosed January 1989 UC (proctosigmoiditis)
~UC meds: Asacol (3 x2 daily); Salofalk enemas nightly for flares & taper to maintenance
~Bentylol (dicyclomine) 20mg as needed; Ranitidine (reflux); Effexor XR 75mg(depression); Pulmicort/Airomir (asthma)
~vitamins/minerals/supplements; Probiotics....(Natural Factors Protec, Primadophilus Reuteri Pearls). @ bedtime
~various digestive enzymes as needed
~URSO for PSC (or PBC) 500mg X 2 daily (LFTs back to NORMAL!!)
My doc's logic.. "TREAT (FROM)BOTH ENDS" worth it !!!