Hi, Welcome to Health care magic forum.
as you describe, it appears to be the
upper respiratory infection, probably the uvilutits, infection of
uvula a growth at the end of the soft
palate.
When you lie down, the growth touches the back of the throat and
cough is aroused.
I advise you to consult an E.N.T. surgeon for diagnosis and treatment.
I usually prescribe to my patient with such symptoms cifixime,
phenylephrine, citrizine, and
diclofenac . Gargle with luke warm salt water.
Avoid taking fruits, juices, ice water, ice cream ,cool water and cool drinks.
wishing for a quick and complete recovery. Thank you.