For asthma:
You've to avoid allergens that aggravate it, such as polen, dust, etc. You should know what you're sensitive to and stay away from it. Asthma is also aggravated in flu and infections so take care of yourself, don't expose yourself to too much cold.
You can prevent an attack of asthma by using inhalers (open up your airways which are narrowed by exposure to the allergens) and taking tablets (which prevents the immune reaction which occurs in your respiratory tract) and all these should be prescribed to you by a pulmonologist (lung doctor).
Asthma improves with age in certain people and in some it doesn't.
You should always carry your inhaler with you at all times and get a regular checkup every year or twice a year depending on severity.
Can't prescribe any medications to you here but I've given you a summary,hope this helps
For other respiratory diseases, you will have to be a bit more specific
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