your right kidney
is swollen, that means either urine is refluxing back into your kidney or there is some obstruction to the kidney; but considering your previous history i think it might be the former. you have not mentioned what has the condition diagnosed when you were a toddler; i suggest you consult a nephrologist
at the earliest so that you may be started on nephroprotective drugs and also consult a urologist
as to the cause of renal swelling.