Sorry for your loss. My dad passed away a month ago. He hadn't been to the doctor in 35 years and finally went. They found a 7.7cm Aortic aneurism and the doctors were surprised he was alive. 3 days later he went into surgery and they fixed the aneurism but his kidneys failed and he never woke up after the operation.
He was 83 and lived an extraordinary life and I focus on that and all the memories we had together. Just this morning I was sitting in traffic and a memory of him hit me, it was rough, but I thought of a good memory we had together and that helped. The world can seem pretty big at times and we really need to focus on the ones close to us and make sure we are treating them right and helping all we can.
One thing I'm thankful for that I did earlier was to voice record conversations that we had or record family dinners talking around the table. It's the little things like that I miss the most and now I can play that back and feel like he's with me.