Yes, you won't heal a fistula without radical intervention (usually surgical but Remicade can knock them out) and often surgery fails depending upon where the fistula is located. If your abcess has already fistualized the flagyl won't really do anything for you, unfortunately. If you are in pain it might be an abcess and in that case the flagyl might help.
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