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You have not mentioned how long!
An X-ray chest and sinuses will help to show any cause.
Raised ESR and trace albumin
may be from infection - repeat after a fortnight. Eosinophil count
should also be repeated then.
(like levocetrizine) and cough suppressants (like dextromethorphan
or codeine) can help in the meantime. They are available alone and in combinations and your treating doctor may prescribe appropriately.
Wishing speedy recovery