Lymphatic cyst

Hi, I was rushed in for an emergency operation 3 years ago due to severe abdominal pains (suspected abscess on my appendix) where a 20cm cyst was found in my abdomen. About 1liter was drained from it and it was found only to contain lymphocytes and nothing more serious. Since then it has grown back so I had drain fitted under CT scan. This did not work due to the structure of the cyst. It has since grown even bigger and I often get stomach pains. The doctors do not know what to do with me - they are unsure of the specificity of the cyst so have gone from referring to it as a 'pelvic cyst' to a 'lymphatic cyst' and have no idea how to treat it. Does anyone have any suggestions or can relate to me?? Thanks!! :D