Any idea what may be causing an odd upper abdominal tickling sensation, a bit like a flutter, accompanied by intermittent nausea? In addition, I ve lost my appetite , and feel full after not eating very much. My normal temperature is around 97F, but tonight it s 98.2F (normal to most everyone, except me!). Wondering if it could be a bug, or exercise-related, a hiatus hernia , or what?