You need to talk with your GI. Vomiting is a sign of a pretty intense UC flare. Along with your increased bleeding and I presume, weight loss, you don't want to put this off. You can refuse prednisone but do go to the GI.
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