How to EMDR if trauma was continuous since birth - not just specific big events?

My trauma stems from a severely mentally ill mother (possibly BPD, NPD, etc). The trauma resulted in a constantly terrified child, growing up in an uncertain unstable environment. My core issues today stem from feeling UNSAFE & LONELY.

I've done EMDR before on specific Big events. But it wasn't enough. And some stuff I probably don't even remember. So how can you use EMDR in this case? The therapist would normally say "Bring on a memory or what memory you want to work on" but in my case, it was a feeling of constant terror perpetrated by a caregiver probably since I was in the womb. Please help