mom is suffering from dry cough for more than one month my mom is suffering from dry cough for more than one month. she says she is not having even slight phlegm .just dry continuous cough.she has cough only when she is lying down.cough comes continuously.other wise she is very normal.consulted doctor and took cough syrups but not effective sir. since one month she is feeling difficult to lie down and sleep.her sleep is very disturbed.i am very worried sir.this is the first time in her life she i s getting cough like this.she says there is tickling and irritation in throat .she feels that inner tongue has elongated and touching the throat. sir please tell your expert opinion and explain what is her problem and solution to it sir.please