I've had a weird feeling in the center of my chest since Monday around 5 PM. It's halfway between a sensation to cough and a sensation to vomit, but it's not intense enough to cause either. I really can't tell if it's in my esophagus or trachea, but I would guess the former. It comes and goes, seeming to be absent in the morning but get much worse as afternoon becomes evening. I went for a three mile run on Tuesday, and that really aggravated it. On Wednesday, I did a thirty-five mile bike ride, and that made me feel like absolute butt-sack, although not specifically from this. Generally, I've felt ok, just this weird chest feeling I've never had.