I am a 58 year-old male. I have a severe (dull) pain in the middle of my stomach (belly button area) and I can't lay down at times. Walking/pacing is the only thing that I can do at the time of the most painful feelings. (I have had this periodically for the past 1 1/2 years, once every 3 or 4 months); I also have a fever (low-grade, for 2 days, now). My stool was black 4 days ago when this started and I also vomited that day. Since that time, I have not had a bowel movement at all (and no vomiting). I just took Miralax to help me to have a B.M. (about 1 hour ago). I take blood pressure medicine (for several years) and my bp is under control. I also have been taking fiber pills for 1 year. I have been indoor skiing for more than a year, 30 min. each day. I weigh 230 pounds, 6'2.