Empty Nests Support Group
Empty nest syndrome is a general feeling of depression and loneliness that parents/other guardian relatives feel when one or more of their children leave home. Empty nest syndrome has become more prevalent in modern times, as the extended family is becoming less common than in past generations, and the elderly are left living by themselves.
It hurts but I have to think back to when I left home and I probably didn't check in with my dad at the time either. It's up to me to adjust (with difficulty) and wish her well.
I hope you can feel better soon and know she loves you regardless. Hugs.