Hi Blue eyes, I didnt read the whole thread so I might be repeating some ppl.
Try using thyme, it is excellent for asthma and respiratory problems.
My asthmatic friend swears by it and it makes your breathing easy.
Another thing, there is a breathing technique developed by a russian doctor which is taught on athma clinics now, you probably have heard about it.
Im sorry but I forget the name of the technique and the scientist, its shallow breathing versus deep breathing which enhances your lungs capacity to take in oxygen.
AS for your allergy, you/your body is hypers sensitiv and you could look into affirmations.
But, I guess you already have. I'm also sorry that you have this, making it difficult to move about in our world full of gasses and smells of all kinds.
She has thyme planted in her garden, lots of it, she says it helps just to brush her hands over them, then they release their volatile? oils and she breathes in the smell so to speak.
You can also make tea and also inhale it with a towel over your head.