B-12 shots only work if your B-12 stores are depleted. Ask your GI for a blood test that checks for those levels. I lost all my stores after 2 straight years of bloody diarrhea. If you have been chronically ill for some time your levels could be low.
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