I understand your problem, cough with mucus can be due to multiple causes like allergic, sinusitis, bronchitis due to seasonal variation or any viral illness.
As you have been in selfisolation, it is unlikely to have Covid -19. No need to worry.
Steam inhalation has no side effects you can take it 3-4 times a day.
Avoid cold beverages.
Indulge in yoga or home workout.
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