I am a normally healthy 28 year old male.  After a night of sharp pain while inhaling, I was diagnosed with pleurisy in an ER and was discharged with a prescription for ibuprofen  after blood tests and an EKG came back negative.  It is 2 days later and I am now coughing up blood.  I also failed to mention in the ER that I had been having blood accompany my stool starting from about 7 days ago.  I have been having headaches and weakness sporadically throughout this entire period.  How serious is this and what should I do?
If you have been diagnosed with pleurisy in the recent past, and now you are coughing up blood, it's better to report to ER and get yourself checked up for pulmonary embolism or some infection or any other pathology.