Yesterday would have been my mom's 80th birthday

My mom would have been 80 years old yesterday.  That's a long time and I am blessed to have had my parents through adulthood.  But wow, what a miserable day I had yesterday.   My father's death was so awful with the cancer - and we lost my mom in 4 days so I guess her death was so much better for her.  But for some reason I just can't get my head around the fact that she is dead.  So strange.