Right side burning pain beside naval.

For the past 3 weeks, I have been suffering from severe abdominal pain and gas problems. It initially started one day after I stayed without eating all morning and then had a meal at around 4 PM. At that time, I felt gas moving throughout my abdomen. The problem was worse at night, and after eating, I experienced pain on the right side of my abdomen. Now, the pain on the right side of my abdomen feels like a stabbing pain, and there is a feeling of heaviness in the lower abdomen. A few days ago, the pain was so severe that I was even having difficulty walking. I can walk normally now, but the severe internal abdominal pain has not improved. The pain is mainly on the right side of the abdomen, starting around the right side of the navel and extending toward the lower right abdomen, where I feel a sense of heaviness. My bowel movements are normal and soft, and I do not have constipation. There is also a burning sensation and pain on the right side of my abdomen. My usg report normal.