Hi,
I think you may find that the steroid for the nebuliser is called Pulmicort. If your son uses a steroid inhaler, then this acts in exactly the same way as the Pulmicort via the nebuliser and will reduce the inflammation in his airways, thereby reducing the liklihood of an attack. Normally, he should take Atrovent or Ventolin first or whatever preventer meds he is on. These are bronchodilators and will help open up the airways and so prevent bronchospasm, which produces an asthma attack. If he takes the Pulmicort or steroid sprays after this, then they will go further into the lungs as the airways have been opened fully.
Did your son ever have eczema before the asthma and is there any history of either on both sides of your family apart from you?
As your son is still quite young, you may find that he grows out of this condition. Some kids do.
I also developed late onset asthma in my 20's and I used inhalers for a while. I do not use anything now as I found alternative therapies very useful. I have regular acupuncture and have never used my inhalers since. I also use homeopathy too.
I can understand that you son may be a little young for acupuncture, but you could still try taking him to a homeopath. It is a perfectly safe treatment and you can use it conjunction with all his other conventional meds. You never know, you may get some good results. If it does help, you may find that you are able to reduce his other meds.
As far as inhaler use goes. He has to find the time when he is ready to use it. At the age of 7, it does not really look cool to use an inhaler in school. Anyway, I am glad that he has now decided to use it. You could always give an inhaler to his school nurse and if he felt short of breath or wheezy, he could always go see her and take a couple of puffs in private, rather than in front of all his pals.
Anyway, hope this helps.
Take care
Sarah