Hi there
I am 43 and earlier this year I have virtually have cured myself of asthma. Basically I started to take superfoods, spirulina and noni juice and my asthma symptoms slowly but surely get less and less. I am now on a mainly raw vegan diet. I have had asthma since I was 8 years old. Now I find that if I do have asthma symptoms now I can more of less tell what brought it on. Grapefruit, dairy products (esp, cooked cheese), some wines (the suphites), beer. When I am on 100% raw vegan I have no asthma symptoms at all, I notice that when I come off that I do get slight irritation. Also, traffic polution can be a problem. I would say look at your diet. I have not been to any doctor or medical establishment in about 8 months (I would usually get repeat asthma medication prescriptions at least once a month) and I have no desire to see them ever again. I find now that IF i have to take my asthma pump or I was also on seratide, I find myself all shakey for and headachy for the rest of the day, so I now don't take them at all. I have also found that I have re-trained my thinking. As I now know that taking any artificial drugs is just simply no good for me, if I do feel a tightness in my chest I tell myself.."well there is no point in taking those drugs, you will be ok.." and since saying that to myself, my chest and breathing normally rectifies itself very soon after. I am also allergic to cats, but again, over the past six months even though I do may still get a mild reaction to cats, it's no where as bad as it use to be, the same for house dust.
So, in a nutshell, look at your diet overall, start an asthma diary, so you can look back and see any link to what you may have ingested. Maybe you have got a new pet? Maybe look at that also. Good luck !