Is It Gastric ?

OP said lower abdominal right side... not upper. And sometimes it is also on the left. For people in difficult healthcare access locations, a gastroenterologist would be a rare find.
WebMD is usually the thing people access to look at symptoms-to-likely-cause links. Pain below the belt could be a lot of things. When did it start, what was unusual in the happenings with the patient before it started, how long had it persisted, what time of the day is it worse, etc. etc. would all lead to pin pointing the cause.

Here is a webMD guide to the gall bladder:Slideshow: Your Guide to Your Gallbladder

 

It's good to visit a doctor and clear your doubts and be peaceful.

 

Food- Have you tried any medicine for gas or stomach pain? In my experience, drinking ginger water (boil one glass of water, add ginger pieces (or crushed) for some time, drink it multiple times per day. Dried ginger can also be used. If the issue is due to food, it will go away. Also check if skipping diary products like milk improve your condition.

Breakfast- skipping breakfast can also create similar issues and is not good for body or brain. Also it will lead to weight gain in some people as body switches to starving mode so that all food will be converted to fat. Try not to skip breakfast.

Persistent Pain- If the abdominal pain dont go away after the above two steps, consult a doctor. They may suggest you many tests to figure out the exact reason for the pain or help you to get an appointment with a gastroenterologist

 

Skipping breakfast is a big fat no, it’s the most important part of the day! There’s a saying which is a key to good health - Eat like a king during breakfast, eat like a prince during lunch and like a beggar for dinner. Rectify your habits and plz visit a doctor if needed.

 

While i was in india , my doctor asked me for a full abdomen scan when i had some pain in the abdomen area. It gives visibility of the internal organs, in a non invasive , non painful manner. Just drink a lot of water, takes may be 10-15 minutes Max & at that time costed me 2K INR, It also helps physicians to quickly figure out most common ailments such as appendicitis, Kidney stones, Gall stones and any structural issues with internal organs. And if everything looks ok, then the obvious ones are related to gastric.

 

But the most important point is that please have dinner atleast 2 hours before you sleep. If you don't, the food while digestion with the acid , gets into oesophagus and this quickly results in upper food path getting infected and leading to cancer. So its important to have dinner , much before you go to sleep.