It often takes a good week for the gas to escape. But burping & farting won’t help because the gas is actually in your abdominal cavity not in your digestive system. The pain occurs because it rises & settles under your lungs causing nerve pressure (the shoulder pain). It escapes by attaching itself to water molecules in your lungs & you breathe it out.
So gentle activity like short walks (around your home, garden, street) as you’re able, marching on the spot, carefully lifting your arms up & down ( don’t pull your tummy) & slow, deep breathing. A heat pad can also help ease the discomfort too.
Yeah binders are a some do some don’t. If you find a binder supportive & more comfortable, use it.