I have been taking the Xithro and Mepron for about three weeks: have just within the last few days developed significant diarrhea and nausea. Could this be a reaction to the meds kicking in, or perhaps die-off? I am a first-time Lymie, so I do not know how to assess these symptoms. Any help appreciated. I have actually had one or two better days in the last week: today feel wretched again: shaky, weak, and with neuralgic sensations in back and hips.