My 43 year old nephew was fully vaccinated and passed away from heart failure two years ago. He was very healthy prior to that. My sister was fully vaccinated and passed away from heart failure last May, she had Covid continuously after getting the vaccine. She had no health issues prior, she was two years younger than I. My wife and I never took the vaccine in spite of family pressure to do so.
We are doing just fine.
so very sorry for your loss