https://www.bcna.org.au/resource-hub/podcasts/episode-22-invasive-lobular-carcinoma/https://www.bcna.org.au/resource-hub/articles/types-of-breast-cancer/A couple of links that will hopefully settle your anxiety!
You mentioned you are a Counsellor. Once you've done some research on the predicament you are in hopefully you maybe able to talk to yourself as a client.
My advice, like others have said, deep breaths, go for a walk or sit out on the verandah with a cuppa! You have the knowledge thus far that it's not in the lymph nodes, how good is that! All the scans will give a clearer picture and the best treatment plan can be established!
Deep breaths!
Take care