Hi T.. I can totally relate. My oldest son is 9 and was diagnosed with these problems at the age of 2. We lived in Rochester, NY when his suffering was worse. He took allergy shots weekly, both arms, for a couple of years. We moved out here to Athens and he suffers no more! He still has asthma and allergies of course but he doesn't even take his shots anymore. He was on all those inhalers and nose sprays too. He doesn't take any of that! He just has his albuterol inhaler in case he needs it, and he takes a claritin daily. That's it, no episodes and no coughing. He's only used his inhaler a few times in the past couple of years.
I also removed all stuffed animals (except one--which I wash constantly), buy new pillows often, new bed, wash walls and toys frequently (because of dusts), no strong smells either (perfumes, detergents etc.) because that seemed to set him off, and this all seems to help greatly. They have those allergen covers for pillows and beds too. I also destroyed the couch! Got rid of it...and got rocking chairs instead. I can wash those easily. Couches and chairs carry SO MUCH crapola! Disgusting. They can never truly be cleaned. They are also made with Formaldehyde! Can you believe that??
I hope some of my rambling helped. Good luck. Let us know if things get better for your little guy.
Namaste,
E.