HI my 17 year old grandson visiting me, can not sleep, complains of nausea, and can not lay down he thinks he will vomit, and sleeplessness... What seemed like post nasal drip from allergy or a cold, from urgent care as they ordered Cetirizine-D twice a day and it has not helped. Same symptoms, and been taking it for a week. I do not believe its post nasal drip he feels nothing in the back of his throat he states.