hello there ! diabetes
with a single kidney
puts you abit compromised. the pther pe sized mass behind your ear is an innocuous thing. could be a lipoma
or some benign lymph
node. if it bothers you you can excise it under local anesthesia
. abdominal pains might state your sugar levels are not controlled or they might be or the neuropathy of the viscera. amorbid condition you have to live and fight with, control your diabetes and start or ace inhibitors for your renal support, avoid toxic irritants and rehydrate your self proplerly and have regular follow ups.
you will help your disease to remain checked and controlled