Thanks for your question on Healthcare Magic.
I can understand your concern. 
By your history and description, possibility of 
pneumonia (
lung infection) is more likely.
In pneumonia, symptoms appear first then appears infiltration on chest 
x ray. 
Similarly when we start antibiotics, symptoms disappear first then x ray infiltrates. 
Since your symptoms are gone, no need to worry for x ray infiltrates. 
It will take time (2-3) weeks for complete resolution of infiltrates.
So get done repeat chest x ray after 3 weeks. 
It will mostly become normal. 
If infiltrates are seen even after 3 weeks then get done CT thorax. 
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.