Your mother is suffering from radiation
induced gastric ulcers
which are a common occurrence after radiation. The same get aggravated by stress and lead to regurgitation and throat pain. She needs to take Tab. Pantoprazole
20mg twice daily and Syp. Mucaine
gel 2 teaspoonful thrice daily. That should relieve her symptoms. At the same time, some useful precautions include avoiding spicy food, coffee, tea, mint, chocolate. Eating food 2 hours before going to bed and elevating the head end of the bed will help further. If her anxiety
is excessive and persistent, it would be advisable to add an anti-anxiety drug (Tab. Alprax 0.5mg at bedtime).