[C&P exam for back condition]

Just had my C&P exam last Monday.  Worried about the back exam that was conducted (DAV added it to my paperwork with other issues I was having with my knee).  I have had  a 40% rating for my back for 18 years.   My concern is that they will recommend a reduction even though my symptoms have increased.  The moving side to side I can do, cannot bend very far forward or backward.  I was very straight forward during the exam, voicing what my limitations were.  But I was reading on several other websites to where the VA goes by the bending and movement performed during the C&P for evaluating the back.  I do remember my first exam I had a flare-up to where I could not bend anyway at all.  That is where the initial 40% came from.  Should I be concerned?