I'm typing to you right now -- stand by, ok?
There are a couple of things that this could be --
1. Reverse sneezing syndrome: This is an "alarming" condition to owners, but really isn't serious. It sounds like a hack and backwards sneeze. Here is a link to some information that may be of some help:
2. If there is something caught, as long as the airway is open and there is no difficulty breathing, you can try to give your dog a couple of slices of white bread (soft, sandwich bread). This can pick up anything "sharp" that may be stuck in the esophagus and ease it's transition into the intestine.
Aspirin is not helpful here -- it can cause GI upset and I don't recommend it.
You can also try some benadryl, 1 mg/pound of body weight. It might help your dog calm down and it won't hurt.
If this is still going on tomorrow, your dog should be seen. I understand that you can't get to an emergency vet tonite due to the distance.
Please let me know if I can help futher.