I pass bad smelling gas frequently. should i be worried?

Maybe: Depending of your age, symptoms and other medical conditions you have, you might want to check it out. Although this may be embarrassing, it would be worth it to establish a relationship with a primary care doctor to talk about it. It may be an example of food intolerance/allergy...Or in some cases more serious problems. Even if it isn't anything serious, they may be able to help you manage it.

Intestinal flora: You need high quality probiotics. Take fermented food which are prebiotics.