If these toxins build up in animal cells - why would you eating meat (that must then have a much higher concentration) not expose you to the same toxins?
Not the OP but I have similar experiences and am also very introspective. For me, my introspection dealt a lot with what my thoughts were and how I behaved, but I had a lot of feelings that I had suppressed so deeply they never really came into consciousness. Therapy helped a lot with that.