yah, definately get to the vet immediately, i don't want to scare you, but this can turn really ugly. never let bloat go.. pls keep us posted.. until you get in thos, keep rubbing the belly, try to get him to move and give him that simi stuff...
if you call the vet and they don't have anything open, don't take no for answer on this one... this is very dangerous.
best of luck.