[nerdponx]

I think the "hypersensitivity" line is BS, or at least it's not a complete explanation. In my and others' cases, the "psychiatric" GI symptoms precede the physiological ones. The only time I ever got a straight answer is when I ended up at the hospital because I was passing out, and they said it was likely some combination of low blood pressure and vagus nerve overstimulation.

[sirsinsalot]

It is well established that vagus disruption during digestion has all sorts of side effects.

Including anxiety.

[nerdponx]

Right, point being that's not a psychological hypersensitivity, it's a lower level subconscious physiological process.

[polishdude20]

Hmm interesting! Maybe I can try measuring my blood pressure during these times of tiredness.