I'm so pleased you braved the difficulty and had that conversation Velcro, and that everything was ok. The thing to try and know/remember is that no amount of her telling you will help... You have to experience it, to be able to internalise it. Time after time of her still being there. Her not pushing you away. Her still welcoming you and being there for you. Eventually your internal system will learn that it IS ok. But yeah, worlds (whilst really good to hear) won't really help, in my experience!

Oh, and PS, the other thing my T taught me (she was amazing!) was that the tiredness is totally normal, because the body and brain and developing and learning soooooo much. Think about why babies and teenagers sleep so much, because the brain is developing at the fastest rates then, so exhaustion whilst undertaking therapy can actually be a really positive sign, it means changes are happening, even if it might be ridiculously uncomfortable at the time.

Take it easy, be kind to yourself and I'm glad your T said you could reach out and tell her you are triggered. I'm sure that will help her to know how to help.