First of all, it isn't wasn't couldn't be your fault. And we all wish we could decide to get over it and instantly be over it, doesn't work that way though : /
So this thread has some tips for dealing with flashbacks, it can help, I know I was skeptical at first, just keep trying things, you will find something that helps (and even if it only helps a little, that's not nothing, right?)
http://www.recoveryourlife.com/forum...flashback+help
I'm sorry your mother is not responding in a way you would like her to/a helpful way. Is there someone else you could talk to, like an aunt maybe, youth minister (I only mention that because that's a resource I utilized even though I didn't go to that church because my own mom... anyway), a teacher.
Also: you deserve love, respect and loooots of cuddles. You can turn down the cuddles, the rest are non-negotiable.