Hello, the toor dal in sambaar might not be agreeing with your gut. It is generally prone to cause acidity and indigestion.
Next Steps
Your weight seems to be a lot on the higher side too. Please do perform certain physical exercises on a daily basis as it will help in better digestion too.
Health Tips
Increase your intake of warm drinking water. Consume lots of fresh n raw vegetables as in salads. Start with small walks n then gradually increase your exercise time.