Huge pity party alert first but the background is I used to have a good, well paid and flexible career which I loved. DH got to be a SAHP and we had 4 DC as I was young, had them close together and maternity leave was a LOT shorter! Occasionally my DC would come to my workplace eg if DH was dropping them off for me to bring home as he had an appointment elsewhere. They always saw this is a bit of a treat as they got to be made a fuss of, eg. middle aged childless male colleagues used to try and give them ten pound notes
and we had office chairs that span etc 
When they were mostly at the age of primary going to secondary school I got sick, eventually had to give up work, gradually got to the stage of being in hospital more than at home, am facing surgery and have just re-written my will. I recently came across a piece of work where a little DC had written about an office visit etc and it's tipped me over the edge a bit.
I think, well I know, they'll mainly remember me as a sick woman who had a hospital bed at home, never really went anywhere with them and was always tired or ill. They won't remember me as the professional woman who used to run them around in a lovely company car (I got to choose a seven seater for the child seats!) and took time out of my day to watch their nativity plays etc. I've kept my good clothes and shoes and they borrow them now and will get to fight over who keeps what
but won't really remember me wearing them. I had lovely expensive hair
but now it's grey and sparse. I had qualifications and clients and people knew me as "Ms work name" and I worked so hard.
It's like I was a different woman but they won't remember me as that. Seeing my DC's homework diary where they wrote about "love visit mum work" and they used "a big yellow pen" etc has just made me sad. We have things like that and we obviously have photos of us as a family when I was well, DH will tell them things but it's not the same as personal memories.
I know I should be grateful I got to see them into young adults. DH was a brilliant SAHP and they were happy. We did have usual teenage dramas, it wasn't all 100% smiley perfect happiness  but now they are hard working, getting good educations and jobs, and they're kind and thoughtful (the ones still at home always ask if I want anything before they leave the house). I'm really proud of them.
I don't regret my choices (to work etc) I regret that I just didn't get the chance to keep my life as it was and they will remember the "after" me not the "before" me. I've written a useful information sheet with my will eg account numbers, insurance details etc and now I think I should maybe also write them each an individual letter with memories etc. It's so hard though (and I have to do it four times! Or maybe one letter to all of them?)
It's silly, we have been so fortunate in so many respects but I'm so sad as I feel like I am losing seeing their futures but they are also losing seeing my past, if that makes sense? God reading this back it seems so self centred and self pitying...
And everything that's happened, it's a fucking homework diary that at the time felt like a right pain in the arse to do each week, that has tipped me over the edge!