Got your message, but I'll reply here as it might help others as well and you'll also get some suggestions from members in the UK.
If a food contains ingredients that are not on the Induction acceptable foods list, then that food is not allowed for Induction. For example, if sausages contain wheat flour, they are not "legal". If some dressing contains high fructose corn syrup (sugar), then it is not "legal" either. This is why it is important to check the list of ingredients.
Now if you ate some sausages which had whatever stuff in them today, no need to worry too much. Just stop eating them from now on and you'll be fine. No tragedy.
But since you "lost" your snack, you need to find something else to snack on
in case you need a snack. You should only eat when hungry or when 6 hours have passed since your last meal. So no mindless eating.
Do you have a food plan for today? If you post it here we can take a look over it.
Good job for sticking to water only!
Regarding the "Induction flu", some people get it, others don't. In any case, it doesn't last long and if you get a terrible headache or something you can always take an Advil until the symptoms go away.
Are you taking a multivitamin?