By sh*t test I assume you mean checking stools for undigested pieces of food, yes?
>There are other definite indicators such as hiccups, >burping, acid reflux, "sore stomach" (liver), pain between >the shoulder blades, difficult and tense breathing.
Well, I definitely feel the sensation that my breathing is restricted - especially compared to a couple of years ago when I cycled and practised yoga regularly. However I don't experience any of those other indicators. Actually, after eating I feel the sensation that I want/need to burp, but nothing happens.