I think I would be cautious about diving in with the difficulties with your current T. I think I'm not the only one on here who has found that it is not entirely easy talking to a new T about an old T. Also, I don't know if this is true - but could your relationship with your current T be defined as traumatic? If so, as with any trauma, it is advisable to build up the relationship with a T first before you really explore traumatic experiences. It's perhaps going to be pretty painful talking about your current T?