What Causes Dry Mouth And Tiredness Inspite Of Being On ZzzQuil For Insomnia?

I took 6 packets of zzzquil (2 pills each packet) in the span of 24 hrs because of my insomnia. I have a history of anxiety and I am also taking Prozac 20mg a day. I m not sure if I m feeling out of the ordinary (psychosomatic)... I am experiencing: Dry mouth Tired (haven t been able to sleep well)