I don't think your T would be upset by you saying that she sucks and that she is not nurturing, I think she would see this as transference and positive that you are feeling it and expressing it to her - it wouldn't be effective therapy if you didn't experience some of your difficult feelings in your relationship with her or if you hid them. I imagine it is satisfying for T's when clients experience them and express them - it shows they have built an effective relationship with us. I too find it hard to 'keep' things for a week until the next session. I can't think of a solution, I just seem to have to live with it. I tell myself it is a stable relationship and Everything I say is ok. Perhaps it is hard got T's too - perhaps they sometimes wonder if clients are stewing over things they said, perhaps they sometimes question afterwords things they said and wonder if the client misunderstood?