In ACT, it sometimes help to identify "clean" versus "dirty" suffering:
(1) Clean suffering being the kind of emotional "stuff" (eg. sadness, anger, fear, etc.) that one might experience as a primary result of being a conscious, real human being in the world...
(2) Dirty suffering as the secondary struggle against the pain itself.
Maybe, just maybe, pain itself is not toxic. Maybe it's human. So let go of the struggle.