Condolences for the loss of your Mum.
Sad about your OH's health concerns coming at this time, that is a lot to deal with and it's never going to be easy to find the balance between your needs and your OH's needing your attention.
You're probably doing a better job than you give yourself credit for so don't forget to give yourself a well done even if it's only for being.
diplomatic when you want to shout.
As others have said find time for yourself and as hard as it is make a real effort to give yourself CARE and keep giving yourself care at this time.
It was a good decision you made to go to your Mum's favourite park and "Sit" with her love and your memories.
Friends can be invaluable at times like these and a counsellor might be a good option too as it is time and support there just for you.
Well done for reaching out and GN'ers have lots of experience to draw on so I hope you have felt heard and supported by the posts you get.
Take Care and may you find nurturing and loving ways to get you through this difficult time.
My four year old grandson "doesn't want me"
Our Welfare State. Is it broken?