Good Evening doctor I started having lower and upper back pains and stomach pains between ribs and navel three days ago. Also constipated around same time...very unusual because 1) i m a vegetarian 2) i have never had any problems eliminating without straining every morning. I ve notice that the pain goes away in the morning but if i eat, the pain comes with a vengeance within 10-15 minutes lasting easily through the night without respite. I have no fever and there is no nausea . I ve tried a mild laxative this morning at 8:00am but so far no results (6pm). I haven t eaten today and so far just very nominal pain in my lower back. I m completely flummoxed by this. I m a healthy 57 year old, retired, that incorporated much walking in his exercise routine. Does this resemble some virus? thank you