This has nothing to do with your sinus problem and all to do with an overweight 18year old just starting on a physical exercise program.
Firstly, it is not a good idea to jog straight after eating, better to jog before as this redistributes blood from your muscles to the digestive system.
This pain is muscular and is a type of cramp and as you get fitter and lose more weight, your chest pain will become less significant.