CWOL, It suck$ that our life plans are blown up by our sitchs. I feel the same way. I had this romantic idea about what life would be like when sons were grown and it was just the two of us. But we are not out of the race yet! Miracles do happen!
BTW I don't see anything wrong with the custody agreement. You may want to address holidays though.
Good luck friend!
Me 41 W 33 M 2013 Suspect A 11/15 Confirm A 1/16 She moved out 2/14/16 Stepson 13 Stepson 16