I am so sorry that you had to edure that. I have PTSD as well, reminants of it and have had it since I was 16..
You said you were diagnosed a few days ago, so is that mean that you are in some sort of therapy?
Flashbacks are extremely hard to go through, and very scary. I don't get flashbacks personally like people usually do when they have been through a trauma, where they see it playing before their eyes. I get body memories, triggers etc, where my body will feel it but I wont know the cause for it. Mine was due to an abusive relationship at 16 which was emotional, verbal, physical, sexual and mentally abuse, included rape as well.

After him I was assaulted by 8 other guys... between the years of 1996-2001.
It took me a long time to be able to deal with all of that.
And I have through therapy, and learning to cope when the flashbacks occur, or if memories resurface.
I know it's a long, hard road, I went down it and made it.. you will too hon. I'm hope things start to look up for you.
IF you ever need to talk feel free to PM me anytime.