Mam the symptoms that you are describing is suggestive of peptic ulcer disease and since you have pain post meal so most likely the same is suggestive of duodenal ulcer..As regards mouth ulcers are concerned it is due to acidity combined with stress and
vitamin deficiency..
Next Steps
Consider the following
1.Avoid hot spicy meals
2.Frequent small meals
3.HP kit one tab twice daily for 14 days
4 Syp Mucaine gel thrice daily 10 ml
5.Tab Supradyn once daily
Health Tips
If the symptoms persist then we may go for endoscopy..
Healthy diet with avoidance of hot spicy meals and increased intake of milk and its products would be beneficial..