Hi My Husband Is 62 Years Old , And Since

Hi my husband is 62 years old , and since January 1st he has lost 15lbs. He now weights 171. Started with what we thought was the flu. He had a flu shot , lasted about two weeks. Then followed by diarrhea which has lasted over two weeks. , Was on high blood pressure medicine but blood pressure was 100 /52 yesterday doctor told him to stop taking bp medicine. pulse is 52. He had blood test and stool samples taken today; Just went to bed exhausted , he is nervous.