In cases of a bloat you would see besides the belly getting larger the dog is normally very uncomfortable. The symptoms you are describing do not sound like a bloat.
Vomiting can be caused by a simple upset stomach, dietary indiscretion, infections, inflammation, foreign body or even part of a systemic disease to name a few possible causes. In any case of vomiting the first thing to do is give the stomach time to rest. This is what you can do:
1- Start Pepcid AC 0.25-0.5mg (Famotidine) per pound body weight every 12 hours or Tagamet (Cimetidine) 0.5mg per pound body weight every 12 hours. You can find these medications over the counter in any pharmacy. Do not give pepto bismol. If you can not find these medications, leave without anything.
2- No food or water for the next 12 hours. Need to give belly time to rest or will continue to vomit.
3- After 12 hours offer a small amount of water and wait half hour, if no vomiting offer more water. If no vomiting, offer small amounts of rice (50%) and boneless (50%) chicken through out the day. Keep on this diet for several days then wean into regular diet.
4- If he continues to vomit after doing the above, follow up with your veterinarian.
Hope the above helps, if you have additional questions I will be glad to answer them.