Chronic anaemia and ulcerative colitis are linked together. Active disease can cause multiple ulcers and blood loss in stools. Also you have a mildly deranged
liver function.
Blood transfusions are a temporary solution.... you need more definitive treatment for ulcerative colitis.
Surgery is a definitive cure.... you should discuss the surgical option with a gastroenterologist and a surgeon.
Next Steps
Consult a gastroenterologist and a surgeon at the earliest.