How is this a mistake? If the side of fish sauce was clearly marked that's what I'd expect, it's not because one employee has a food allergy that everyone should go without.
Must have been more than that or the culmination of many errors.
-or-
These catering agencies are so mercurial that that's just not an effective channel of distribution
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That particular catering agency perhaps has other issues and satayco would have lost them anyway. Hence the "can't rescue the relationships" (realizes it's an abusive relationship so to speak).
Trust me, we know. Most of us here have our own thing going on, and we know that terrible sinking feeling. The feeling that you've disappointed your friends, family, the whole world even. I also know how terrible of a place it is to be. And putting your name to it is much harder. I don't really have any advice because I don't think I'm qualified enough on this topic. But I will say this, stay strong. This is not the end of the world. Your family and friends will not stop talking to you, they will not estrange you, insult you, humiliate you or anything like that. What ever thoughts arise, they are all in your head. Make sure you have enough personal savings to tide you over, and please stay strong.