I have a feeling the doctors obviously have to tread carefully when dealing with masses sandwiched between organs. They would not plunge in and operate without a great deal of investigation and thought. And there is probably nothing that can be done until you know whether it is benign or malignant. However, things seem to be looking good for you as far as your blood and other organs are concerned. The "waiting for results" and "not knowing" is so incredibly frustrating and I know exactly how you feel. Try to make an appointment with your local doctor or your specialist and voice your concerns. They may even speed things up so that you get quicker results. It has worked for me in the past and is always worth a try. Do you have CT scanners where you live locally? they are the most amazing machines for showing up faults in our bodies and are used widely in the UK.
Good luck and I shall be hoping that your results are benign.