Past experience with UC meds does not mean future positive experiences with UC meds. Sometimes the meds that once worked to help us, fail us. I don't know how your doctor could predict your future but changing enemas might be the trick to get you in remission. I would take his advice and try the steroid ones.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free