MB,
I am so sorry to hear about
this! It was a rude awakening to start with...
...and then to see your child suffer with the effects of a stomach flu...well, I would say anyone would be triggered. The stomach flu is pretty awful!
You are not a failure...this just happens to be your challenging issue. You excel at many other things that a lot of people do not. We all have our strengths...and areas where we struggle. That is the universe balancing itself out! ;)
Keep using your coping skills and your rescue med as needed. This is rough, but you will get through it...and have a situation to look back on and say..."Yeah, I did get through that!"....and be a little stronger for the future.
(((Hugs)))
S.C.