I was walking the path outside my apartment when I glanced up at the sky to see a bright object flying above me. It was silent as it passed. I watched it hesitate maybe hover for a split second before it shot off. The object was very round and not plane-like. It was too bright to see any serious details except right before it shot off it lit up red in the back. I was close enough to notice it looked like sparks or fire then it disappeared silently within a second. It never made any sound at all. While watching this I got a really bad stomach ache. I waited a while before going back inside not feeling any different but later inside I had a bad static like rushing in my right hear. I felt dizzy and nausious then developed a major headache behind my right eye. After a while it went away but my lower abdomen kept hurting awhile longer.