Hi, I had to reply because I think the same thing happened to me. I was taking Zoloft 25mg and out of the blue I had the worst panic attack, plus nausea and felt like I was going to pass out. I have since switched to Effexor and now Paxil but never thought to blame it on the SSRI itself. I was just checked for Lymes and don't havae it but am wodnering, did this all get better for you after the antibiotics or after dropping the SSRI's? I have never heard of Serotonin syndrome. Hope somebody can help you with this.