I feel ya. My first cycle, I applied to 63 schools and didn't get a single interview. Honestly, and please understand that I don't agree with this, but I don't think adcom's give much leniency to people who had to overcome losing a parent/family member. It seems like a lot of people write about that and when I met with people from UM, they told me specifically not to write about it because it's not unique. Write about it in your special circumstance essay but not in your primary and don't make it the main focus of your secondaries.
Have you done a post-bacc or graduate school? Even with a higher MCAT, if you don't have proof that you can succeed in graduate-level science classes, you may struggle to get an acceptance.
I'm sorry man. I know this sucks. It's so unfair seeing those who had it so much easier than you succeed over you.