Hi Philomancer,
Welcome to the Nexus. I don't think anyone here is qualified to answer your question.
I can speak for my own experiences and beliefs here. I do believe psychedelics can help retrieve repressed memories but only from a time that we can actually remember. The human brain changes completely as we grow from being a baby to a toddler.
Given that the physical architecture completely changes, I do not believe one can retain memories from babyhood. Anyone. Obviously events that happened to us during that time can be formative and teach us how to relate to the world, but I do not believe it is possible to retrieve a memory that has no physical matrix to reside within.
I HAVE successfully retrieved disturbing repressed material at age 42 from approximately age 7 using psychedelic drugs as the catalyst. It was very unpleasant and I spent much of the time moaning out loud and clutching my head. I honestly felt a psychological professional would have been helpful to me on that trip. Now age 7 is an age where most folks have intact memories, where our brain architecture is close to what it will be in adulthood, though much more growth/connections are needed.
Regardless of all this ranting, I do think it is a good idea to speak to a counselor about all of this and these feelings. No need to mention a DMT trip. You can say it was a dream or something similar. Clearly there are themes of childhood trauma, feelings of abuse, neglect, feelings of incomplete memory, etc. Maybe it would make sense to talk to someone about all of this.
Welcome to the Nexus. There is much to be found here. Hope you'll take some time to look around. I sincerely hope you find some answers and some peace in your quest.