Celexa Side Effects: anxious thoughts and panic from side effects http://www.medications.com/effect/view/35970 anxious thoughts and panic from side effects Took first dose of celexa 20mg before going to bed last night. B Thu, 11 Dec 2008 10:51:51 -0500 http://www.medications.com/effect/view/35970?item=15193 Took first dose of celexa 20mg before going to bed last night. Baaad mistake. Woke up at 03:00 in the morning with a panic attack, thought I would throw up. Thought night time would help subdue the side effects. Some dizziness noted. Shaky in am. some nau http://www.medications.com/effect/view/35970?item=15193