Hello I have polycythemia and I too have pain on/off and a feeling of fullness and can only eat very little.My stomach is very swollen, today was the worst day, typical my doc on holiday!it helps with a hot water bottle but think I will have to go to dod,I have had a screening but it didnt show anything.I am going to persevere with this though because I am so fed up with it. I hope you get somewhere.Anna.