Hello. 21y/o F in excellent physical shape, vitals great, but it feels like there is a pole sticking through my upper chest just to the right of center. Pain aggrivated by swallowing. Very little appetite. Gradual onset. Just returned from Africa. Taking doxy, wondering if possibly a reaction to that. Been taking omeprazole for 3 days with no change. Over the counter pain meds also have little affect. Has been occuring for 8 days with gradual worsening, accompanied by diarrhea. Went to ER, blood tests, EKG, and chest xray revealed nothing. Any suggestions? Thanks!