It is possible that you haven't found all the triggers for your asthma. You may need to "dig deeper" for any triggers in your diet, your environment, your personal care products, your detergents, shampoos, cosmetics and anything else that you come into direct contact. Keep a food diary for at least 2 weeks and write down all food you eat-- and any symptoms after eating that food. Switch to all natural personal care products and natural fiber clothing. Household furnishings and carpeting can cause problems as well. Find an asthma specialist to help you through this process.