I found myself going back and reading it several times today, along with the email response... I don't know, but it just really got to me.
I broke down right before DD turned 6 months over this same thing. I couldn't get thoughts like this out of my head. My mom's mom passed away when I was 6 months old, which set me off when my DD turned 6 months. I was scared of my mom dying, me dying, DH, everyone... It was really really hard.
Whoever wrote this, you certainly aren't alone... PM me if you need someone to talk to. Secretly, obviously.

Re: TBPS - This one gets me really choked up
This was eventually what I had to pound into my own head, over and over again, to get it to stop consuming me. Every now and then, it still pops into my head though.