A few years ago my fiance and I were both taking colliodal silver regularly (maybe a tsp per day.). During this time of year everyone around was falling out with a 3 week flu bug that go you spewing out of both ends. (sorry ladies)
My fiance started throwing up on day and I took her home and she proceeded to do this for about 5 hours. That was it!
I went home and had the bug for 24 hours (a bit worse than her... I passed out.)

My point. Our bodies were able to fight the bug. We were not unaffected wholly but we were able to fight it off. Everyone else around us had it for 3 weeks average.,
I'm convinced of the value of colloidal silver.

I don't think you had the flu... The flu is a respiratory disease, not a gastrointestinal one. You may have had a Norovirus or even a bacterial infection. And to think you could have avoided it altogether with simple handwashing and other hygienic practices.