You have underwent 2 sets of CT scan
as I understand.
The one done previously showed right groin lyphadenopathy with 3 cm node(lymph
node) that has now reduced in size ( your current report shows the size as 2.5 cm) that is good sign and reassuring.
Any node that diminishes in size on subsequent CT scan is quiet reassuring.
So your Doctor rightly said no need to worry.
As you are going to consult your physician in a week time you need to relax now.
Hope you understand my reply
with best wishes from Dr Chowhan