Hey Stu, it happens. Wwe are all human and all learning so much about ourselves and our reactions to different situations. I tend to be great when people are "watching", no matter what situation, but alone....phew.
Thing is, dont beat youself up. Rule a line under the event and get back on the wagon. You may find a tiny blip on those scales, but you will know why and you will be able to correct it very soon.
Hugs to you.xx