I have been taking Guaifen for 3 days for a sinus infection. . .I feel dizzy and dazed from it, and it is making it difficult for me to consentrate and focus at work. It also has made me feel weak and lethargic. . along with cotton mouth and itching all over. My appetite has been surpressed, and I am having trouble resting. It is like my body is tired, but my mind won't settle to sleep.