(Learn how and when to remove these template messages) A budget is a quantitative expression of a financial plan for a defined period of time. It may include planned sales volumes and revenues, resource quantities, costs and expenses, assets, liabilities and cash flows. It expresses strategic plans of business units, organizations, activities or events in measurable terms.
The mouth could be feeling raw due to canker sores, Vit B deficiency or Vit C deficiency. It could also be fungal infection. It is difficult to comment beyond this at this stage without examining your mouth.
The roof of the mouth hurts when you eat because it can be easily disturbed. The mouth is sensitive and often in contact with foreign substances (food, drink, that packet of chips you rip open with your teeth, etc.), so some of them are due to react negatively to the body.