My 4 year old has asthma and allergies....?

He has been allergy tested and we know what his triggers are and limit his exposure as much as possible, but we live in the country and one of his major allergies ir grass pollen, also we have had torrential rains over the past week and are expecting 4+ more inches by tomorrow night and mold is also another big allergy of his. He takes Zyrtec, Singulair, Nasonex, Albuterol, a Multivitamin daily along with cough medicine and vapor rub PRN. We can not use a vaporizer due to his mold allergy. But as the weather has been lately he is having an allergy attack and illness induced asthma. We due the nebulizer along with the rescue inhaler as often as needed. Is there anything else we can give him to help relieve his symptoms? We give him plenty of fluids and let him nap as often as he feels even if it is close to bed time....I just want him to feel better and I don't think there is much more we can do with all the medicine he is on? I don't need any smart opinions like did your doctor tell you to come here, I am a grown woman looking for advice without taking him to the doctor because I know what is causing his ailments! Thanks!