It all started 6 weeks ago. I thought I had contracted an STD, (recent tests show I'm negative) and have been plagued by CONSTANT anxiety and panic attacks all day, everyday for the last 6 week's. But ever since my very first attack, I've had such crippling fatigue and muscle weakness. As well as on and off chest pain, sore throat, and confusion. I thought it was a symptom of STD infection, which fueled an endless cycle of anxiety and attacks. I wake up exhausted, and have no energy throughout the entire day. At some points during the day I crash harder than others. It feels like an adrenaline rush going through my body, but instead of an energy rush it feels like a DRAINING rush. It's very weird and worrisome . Is this CFS?