Oh no I've just seen this poor Soul and poor you with worry..........it might just be gas
Maybe massage his tummy very gently clockwise in circular motions when he's roaching, I do this with all our three dogs when they have an upset tummy.....it appears to help them.
Hope he feels better, when the vets are open it might be just as well to ask them to put him on a course of antibiotics.
Hug him from us...