You'll regress until you start producing the cortisol level that was at the previous level...at least that's how I understand it.
Were you having any symptoms at the 20mg?
Did you just start to have them at the 15mg?
You can consider to stagger the dosage 20, 15, 20, 15, 20, 15..etc and if you have no symptoms then do the 15 for however long. Do the same at the next drop.
Can you maybe consider to use a steroid suppository to help with some of the rectal symptoms?
Also consider to use a fibre supplement to help bulk up the stool. It'll slow down the bms a bit.
Hope you feel better soon.
*Heather*Status: mini flare Dec 28... tapered to every 4th night
~diagnosed January 1989 UC (proctosigmoiditis)
~5ASA: Asacol (6 daily) + Salofalk enemas (increase for flares tapered to maintenance)
~Bentylol (dicyclomine) 20mg as needed
~Probiotic 3(Natural Factors Protec) bedtime + 1 (Primadophilus Reuteri) occasionally
~multi-digestive enzymes as needed ....zymactive 3 - 5x daily
~Ranitidine,Pariet (reflux) Effexor XR 75mg; Pulmicort/Airomir (asthma)
~URSO for PSC (or PBC) 500mg X 2 daily (LFTs back to NORMAL!!)
My doc's logic.. "TREAT (FROM)BOTH ENDS" worth it !!!