Yeah my mam also died suddenly, although we knew she was terminal, my mam had lung cancer. If the docs hadnt of told us we wouldnt have known. “Mam kept telling them but im not ill i feel fine and ur telling me im dying” they told her she had months to live on the wednesday and on the tues after she rang as said can u come over (she lived 5 doors away) as she didnt feel right, i got the doc and he said a heart attack was imminent and that he could help, but mam said id rather die quickly than suffer of cancer, low and behold 5 hours later after a quick degrading of her health she died in my arms on the bed, she told me she was sorry she was puttin me thru this and that she will miss me. And then closed her eyes. She was my best friend not a day went by that we disnt spend together. So i get how ur feeling. Had my mam lived to a hundred it still wouldnt have been enough time for me. As most people would agree. The pain never eases and im 6 months in and it still knocks me off my feet.