Oh sorry you are so low. I hope you stayed 100%, you'll feel so much better if you do. I had a horrendous day emotionally on Friday and was tempted to give up ... I didn't and I cannot tell you how happy I feel not to have give in.
Im not sure if tuna will take you out of ketosis, I would assume so if it's tinned but who knows. It won't taste nice so don't do it x