Spondylolisthesis

I have been diagnosed with spondylolisthesis at the L4 and L5.   The doctor immediately recommends surgery.

I am doing PT to strengthen my core and got an epidural injection yesterday.  Sadly, swimming seems to exacerbate the pain.  It doesn't hurt during my swim but I am in pain the next day. 

I also have had to drop flip turns.  Twisting and arching the back are not good!   The doctor who gave me the injection thinks that I can start swimming again once the steroid takes effect (if it does).  I am concerned about causing more damage to the vertebrae.  I am going through major withdrawals without my swimming. 

I wondered if anyone out there has experienced this condition and how they are doing?  

My gills are drying out!  Diana