My digestive system has gone completely crackers too. One minute I can't go, next it's like there's a tap up my bum. It's horrible!
I suffer with generalised anxiety disorder so I can't tell whether it's this triggering anxiety or anxiety making me crap through the eye of a needle. Probably a bit of both.
I found the gingerbread men I made the other day OK to eat. I find shop-bought biscuits bloat me out. Maybe try white bread, white rice, Bananas, ginger etc. Just stuff that will firm things up and not irritate you