Abdomen Pain/Discomfort since 9 months - undiagnosed - lactose question

Hi,

Have:

Discomfort/Pain under left/right ribs

Soft Stools

since around 8-9 months. MRI,MRCP,CT,EUS x2, blood all clear. Endo and Gastroscopy also done. Nothing seems wrong.

Recently got diagnosed with lactose intolerance. Was suprised since I can eat cheese and milk and get no reaction. Stopped eating any lactose for more than a week now and still feeling bad. Is there another reason I could have false positive?