Hi BlueSky,
DS1 was diagnosed by Rohan at about 2 1/2 years old. Rohan initially prescribed the inhalers that DS1 needed. After the initial diagnosis and prescription the GP dealt with it from then on. DS1 is on Seretide, a combination inhaler (preventer and reliever) and occasionally needs extra Ventolin and Redipred. He has been so much better since being on the Seretide.
DD was diagnosed by the GP at age 5. She uses Flixotide (all year round...we did stop it for a while and that was a big mistake!), Ventolin when needed and occasionally Redipred.
Both of them had used Ventolin when required from when they were babies onwards.
DS1 has a history of recurrent chest infections and DD has had three bouts of pneumonia this year...for both of them, most of the time these issues start off with asthma when the are run down and then follows on with the infection or viral illnesses.
Both have high RAST results for their environmental allergies too...dustmites, grasses, cats, dogs, DD plantain and mould, DS1 horses. There are probably others I can't remember

.
The Asthma Society are AWESOME! We have been using their services since DS1 was diagnosed with asthma 3 1/2 years ago. They provide a free service and do home visits. They make recommendations to your GP/Specialist about what type of asthma treatment would be suitable (although they can't prescribe). They educate you on what asthma is and how it effects the body, and how to correctly use the inhaler and spacer.
I hope that helps with some of your questions.

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Mum to:
DD 8 - Nut allergy, anaphylaxis, environmental allergies, asthma
DS1 6 1/2 - Food & environmental allergies, asthma, eczema, Coeliac disease
DS2

11 months - Food & environmental allergies, reflux, eczema