Hoping things are quiet at your house tonight and that the gums don't get any paler. If I have the funds, I usually figure even a vi$it to the e-vet better than a worried, sleepless night.
Our primary vet before we moved suggested letting the dog fast for 24 hours, and just offering fluids, to help the gut quiet down. I usually caved before the 24 hours, but I do keep low sodium broth in the pantry to offer as a fluid.
Some dogs tolerate peeled potatoes or pasta better than rice.