I have ibs and a dairy intolerance, i have noticed lately that i cannot eat bacon or onion or i feel sick, can this be an allergy?

Diet: In general, foods high in fat, fried foods, spicy foods, alcohol, and caffeinated coffee and tea can be problematic. Some foods, such as beans, cabbage, broccoli, brussels sprouts, cauliflower, peas, onions, and bagels, that can cause minor discomfort .You have also lactase deficiency which is often associated with ibs and limits dairy intake. More likely related to ibs than allergy.Consult md.