Can Taking Pariet Tablets For Stomach Ulcer Lead To Headaches?

my mum was on pariet tablets for a stomach ulcer, she stoped taking them thinking she had side effects, headaches, but the headaches were due to a tumor in the cerabelum which she has had removed, 2 weeks ago. mum has had 2 sessions of radiotherapy and more to go but is suffering with burning of the stomach and reflux and vomiting being the weekend and back to radiotherapy tomorrow i was wondering if she started with the pariet again would that help with the symptoms she is having?