Hi Heather
I'm 55 (like the avatar which was me 2 days ago... with FaceApp? 40s are nothing..) and last year took the plunge, my story is similar to yours, but married 25 years with 2 late teenage sons. They all accept what I have to do, and that it is a necessity that I have come to terms with and accept as part of my life. It sounds like that if you don't do something about it then you may end up going down the depression and anxiety route eventually and end up a silly girl like me. I still have my family but they live very close to me not with me, and I see them on a daily basis and we are good friends. Hard as it may sound, you must be the priority sometime, otherwise you would never be able to be truly happy and be able to support them as all parents and spouses do. If you get rejected then hopefully they may come around and recognise and respect you in a while, never give up on that.
It is a journey that we only have a partial map for, a bit like an explorer of our own destiny (Density in my case aka Back to the future 2 or 3 or something).
However here at Susan's we will help where we can, offer supporting words and insights into our experiences and how we did or did not cope.
You are not alone.
It is unlikely that no one here has experienced what challenges you have ahead of you, so just ask, we, above all others, do not judge anyone on the site who needs help.
Love and Hugz
Katie
Incidentally, one of my goals is for my grandchildren when they come to only ever have known me as me, Katie. So looking forwards to that. x