my mom aged 41 yrs is suffering from unbearable itching from the past one week,the itching is on the entire body..it worsenes in the night..she was taking one single tablet of cetzine evrynight..she consulted a doctor and the doctor prescribed - bandyplus,ebasil,polarmine..but to no relief..the pain and unbearable itchng is the same..please help...it has started from the day she took a medicene phexin and deriphyllin retard 150 for incessant coughing....plzzz help