People get diagnosed (both in physical and mental health) with all sorts of things based on symptoms but not knowing the cause clearly. From your posts, it does seem like you cannot just let this whole thing go. I agree with those saying it is dangerous (also also ineffective) to push something you don't remember. Perhaps you could focus on working to ease the symptoms though? The discomfort around the sexual abuse topic. Many people with all sorts of PTSD find it helpful to develop coping strategies for the anxiety, when symptoms surface. After all, the symptoms are the problem, the original trauma was done and cannot be changed.

I had (maybe still have) classic PTSD symptoms due to a chan of interconnected traumatic events in adulthood. It led to major avoidance and the avoidance just exacerbated the problems and allowed the chain to progress for the worse. I could not do anything about the initial events in the past but could definitely step in to break the chain, face my anxiety, exposed myself to dealing with it no matter how much panic, and get out of avoidance. Not an easy task and it wasn't completely linear, but very efficient in the end. I did not use therapy for it at all.