Recent surgery left me with CES.. Will it get better?

Your concerns and fears are an inevitable part of the process of adjusting to your injury and new physical status.  may I ask, before your injury did you have a tendency to worry about certain things?  I am a worrier and have found that to be it's own problem.

For me, coming to accept my current physical status has been a long journey.  It is fair to use the word "denial".  I hoped so fervently to return to "normal"  that I was quite slow  to recognize which things would not heal or get better. The good part of that is it offered strong motivation for many years to work hard at rehabilitating myself.  

Bowel and bladder did not worry me so much once I learned to manage them.  After 7 months of trying to empty my bowels using only digital stimulation or stool softeners, i was thrilled to discover bisacodyl (magic Bullet or other) suppositories.  It worked, I moved on.  Once I learned intermittent catheterization, working round the limitations of quad fingers, I moved on.  I wish there were a fix for bladder function because it so dominates my life and daily choices.  But there isn't, so I deal with it. 

My inability to walk well enough to use it for transportation was much more difficult to accept.  Eventually even stubborn me had to admit, after about 5 years, that  it was unlikely to get better.  I have been able to improve my coordination so my daily activities cost less energy.  Each of those small gains make a big difference.

What you mention with your legs will keep changing over the next few years especially, though for many the period of change lasts many years.  Do your best, but there is little to gain from being attached to any particular result.  No one here can tell you what to expect.  Each of us is different.  The emotions of hoping and fearing can bleed off a lot of energy. 

Hope? YES!  Feel it and use it and live it but let it be hope that things get better, not a hope of particular out comes, of HOW things get better.  Life will surprise you but you will certainly be able to cope with all of it.