Do you have any jaundice ?
For constipation - eat lots of fibres , no bakery products, plenty of oral fluids , syp cremaffin 30ml at night
For chest pain - pls get an ecg done and show it to a physician
Otherwise ur pain from oily food is most likely due to your upper Gastrointestinal issues
Next Steps
Get
Liver function tests done
Repeat your sonography from a senior sonologist SOS CT scan of the abdomen if still doesnt have any results u can see a hepatobiliary surgeon