What Causes Pain In The Lower Back And Legs?

husband has had a knot in his chest with exercion a few times, lower right back pain, lower right hip pain that goes down right leg, swollen feet, three episodes in three months of severe pain under right rib cage, impotence,enlarged prostrate, urinates frequently but dribbles, no pressure to pee, episodes of vomiting and diarrhea in two weeks time but no fever...and ate normally during that time..forehead is clammy with sweat beads, loses balance sometimes, sleep apnea...severe...loss of appetite but bellys getting bigger,