What Causes Fatigue While On Amlong-A?

My mother is 65yrs old. Her Gal bladder was removed in 1998 due to stones. She takes one tab of omeprazole 20 mg everyday. She is Hypertensive and takes Amlong-A one capsule everyday. Since few days she is complaining loss of energy and sometimes nervousness. She feels like taking rest after little bit of household work.