It happens to me now and again.
I suffer from IBS that strikes in the middle of the night.
Wake up in agony and then have to spend an hour or two in the bathroom.
I think tonight's attack is thanks to a large amount of sweetcorn. Combined with the fact I've eaten crap the last few days.
Trying all the deep breathing etc. It's just so painful and scary. Thankfully my bath is is front of the loo so I can lean forward and rest my arms/head on it.