Right side pain

I have been having pain in my lower right side for a few weeks. Right under ribs. Usually after I eat. I eat lots of fruit and vegetables so I've hear it could be excessive has built up .

But I do not have constipation, diarreah or trapped gas.

I went to a walk in clinic dr who thought I may have costochronditis , inflammation on rib. She said take tubelike and Advil. I also went for blood work abdominal ultra sound and chest x ray all came out normal.

I went to my personal dr and she didn't think it was costocronditis. She seemed confused. She said maybe my muscles are weak or tight and to go for physio. She gave me an anti inflammatory med but hasn't helped. Making me feel nauseous.

What is wrong with me? Where do I go from here? I'm in a lot of pain