Caduet is for high blood pressure (Norvasc) AND high cholesterol (Lipitor) together so you only have to take one pill so there is probably more going on with you than just high blood pressure.
What did the doctor tell you?
Some of the possible psychiatric "adverse" effects include: sexual dysfunction, insomnia, nervousness, depression, abnormal dreams, anxiety, depersonalization.
From:
https://www.pfizerpro.com/product_in..._reactions.jsp