Hi welcome to health care magic forum.
Thanks for calling H.C.M.Forum.
You got operated for appendicitis
. But now again getting pain in the right lower abdomen, back and low upto the knee.
The pain could be due to urinary tract infection
, stones in the urinary tract
of the iliocecal junction, or may be due to post operative adhessions.
I advise you to consult a general surgeon
, for diagnosis and treatment.
You may need to have M.R.I. besides other routine tests for confirmation.