Lower right abdominal pain along with a tight, bloated abdomen is a symptom of appendicitis. Please go see your doctor as soon as possible!
Yeah it usually is and I wouldnt delay getting to your doc/hospital, however if you have no luck and its not that then consider, renal colic and kidney stones, gallstones/gallbladder as well as much more rarely a thoracic disc herniation at t8 to t12 would be overlooked by most docs as so rare.. I had the same thing and it turned out that I am in the one in two million people with thoracic hernations pressing on the nerves that innervate the right abdominal area! It causes the same pain as appendicitis etc. Good luck.