I can relate to this stuff. The earlier the trauma, the more it just makes me feel hurt and angry, in a simple kind of way. And later, shocked that my parent would hit me out of the blue.
I have to say the body memories seem most real/now and painful from the earlier traumas compared to the later.
When I was a crawling baby I was hit in the eye. When I had the flashback, I had to ice pack my "black eye" for hours, it hurt SOOOO badly.
Early traumas are retained mostly as a physical sensation and secondarily as an emotion, with rage being the most common secondary reaction to the pain and the neglect.
I'm so sorry. The good news seems to be that once it surfaces and breaks free, as bad as it feels at that time, if you can accept that it happened a long time ago and process the body and the emotional feelings, self-validating, sharing them, or whatever feels needed, they don't come back.
They only have come back if I blocked aspects and tried to not process them/deny them.
I validate that this was an early, preverbal traumatic memory of deliberate abuse intended to hurt, that you couldn't escape, and which would make anyone angry for how deliberate, repeat, and hostile it was.
Nobody should ever smack a baby no matter how much it was crying or whatever. That is just so, so wrong.
I have two children. I have never hit them, even though they've done some really annoying antics sometimes. I think most often, only someone on drugs would lack the self-control to refrain from hitting a baby or toddler.
Did your caregiver(s) have addiction issues?
I hope that you have a good trauma therapist or somatic processing therapist. Coloring works wonders!
Have you tried a scent, like aromatherapy? I use plain, old Vicks to help pull my brain out of flashbacks. I just hold the open jar under my nose and take deep breaths. I also sip ice water.
Hope something helps. Also, tell yourself, "I'm just having a flashback, it's not happening now, this was a long time ago." Over and over, and say, I'm strong, I can get through this again like before."
Hugs if you want them,
Muse