Don't feel guilty at all kim.He was sick when you saw it on Sat night.He would of showed you during the week if he was sick earlier.Even though your working so much...he would of told you while you were in bed by climbing on you or coming to you and waking you up.showing you he was in pain.so forget the guilt.

This seems the best way all around.
Saving up money...getting him stronger...and then surgery.(expected surgery)so your not so stressed.

And we always had emergencies on sat afternoons or nights.It seems the night they like to be sick