depression
"I developed Serotonin Syndrome.  Diarrhea (to the point of leaking), drowsiness, increased body temp, very blurry vision, looked & felt drunk, bloating, weight gain, dry eyes, red bumps on face, feverish, felt like I was getting the flu, gas, heartburn, craved sweets, no concentration or focus, forgetful, clumsy, insomnia, etc.  Four symptoms showed up during the first week on 10 mg, the rest showed up during the second week (20 mg).  I've been on many anti-depressants over the past 17 years (Zoloft, Effexor, Lexapro & Wellbutrin XR worked the best) but they would all eventually lose their effect.  The only other time I've ever felt this bad in relation to a medicine was when I was going OFF of Lexapro.  Viibryd is a "no" for me!!"