Feeling of something stuck in the throat and burning sensation in throat indicate GERD, acidity and reflux. However the cause for white spots on the lips is difficult to understand.
Next Steps
Start tab PAN D once daily on empty stomach in the morning. In the meantime, consult online within a week, with pictures of throat and lips.
Health Tips
Avoid hot spicy foods, excessive tea and coffee, sedentary lifestyle. Your profile states your weight as 100kgs. If true, consult a dietician also.