Hi welcome to Health care magic forum.
Thanks for choosing H.C.M.Forum.
In mid august you had floods and you have used the stagnant water after 3 days. Due to floods there might be more of moisture in the rooms, followed by infection in the lungs. ventilation problem might be of the rooms may be of the lungs.
I advise you to consult a physician for diagnosis and treatment.
There also a possibility of fungal infection
of the lungs , as a primary infection or a secondary infection due to antibiotics. you may need to have anti fungal antibiotics and stop the antibiotcs.
Wishing for a quick and complete recovery .