Hello Maggie and welcome from all
You are not self indulgent, you are the same as all here,
Sorry you are struggling, are you having medical support?
I live alone, have done for years ,my husband died young, our little girls grew up and married . Lived alone since but always had dogs.
Please don’t think you are a failure, you have brought up your daughter, she has confidence and is starting a new stage in her education. You have a job, you have good friends , failure ? No way.
On a personal note, don’t wish you were not here, my darling elder daughter took her life 15 months ago, my two granddaughters were at university, the younger one in her first year , she had to start her first year again when she should have been in her second year.
An ‘empty nest’ causes distress for so many mothers but we adjust and you will.
Do stay here , you will have support and understanding x