You'll need to provide a more precise location of the pain when describing your ailment to a doctor (Where exactly on the right side are you experiencing pain?). Several acute conditions can cause pain on the “right side” of the body such as: appendicitis, renal colic, billiary colic, ovarian cyst rupture or infection… Some of these conditions can be urgent, when located in the acute abdomen (like appendicitis), and may require surgical intervention. In such cases, the pain is extremely severe. Taking painkillers in cases of an acute abdomen is a great mistake because calming the pain can mask the real disease. An acute abdomen can be diagnosed only with a physical examination.
According to your description, it doesn’t seem likely that you are experiencing the symptoms of acute abdomen. Proton pump inhibitors (PPIs) are not painkillers and won’t help you to relieve the pain. Metoclopramide, might help calm the belching. You can go to your primary health provider for an examination and diagnosis of these symptoms.