There are various modern treatment protocols. Avoidance of salt has no relationship to your problems. Neither will drinking 4-5 liters of water. There is an Iranian physician that advocates hydration therapy and has written a book on it, however there is no solid evidence it helps.
Asthma is caused by an immune system reaction to an antigen, or non-self substance.
Common treatments in the United States include anti-inflamatories, drugs to remove mucus, and drugs to open up (and keep open) the airways. In some cases acupuncture may help. Another protocol is to de-sensitize a person to a specific antigen by careful administarion of a substance to which they are alergic. And, of course, avoidance of dust and antigens. This means control of the environment.
Post-infection syndrome is common, and getting rid of these infections can be a bear. Often you start with a viral infection and then a bacterial infection piggybacks. Problems with breathing may last for weeks. This is a crummy situation.
There is no simple answer to your question, but evaluation at a center that specializes in asthma will be helpful.
Hi sounds like it may be reactive asthma. Your Dr can determine if so and a treatment plan of meds, etc. It may "react" to the environment or illness.
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C~