Could adjusting a pacemaker cause digestive issues as a side effect?

My 92 year old grandmother has had a pacemaker. Three weeks ago,on June 5, they :tuned her pacemaker up since she said she was feeling sluggish. She got used to her new setting, but started developing stomach issues around a week after her pacemaker adjustment on June 12. She says her ability to eat anything other than eggs and soft food has deteriorated, and that she is having problems sleeping. She also claims her stomach is upset and that "she just is not feeling right". Could this be due to the pacemaker? Or is it just coincidental and more likely due to something else?