I got into a bad argument with my brother and i started feeling nauses a littke bit after then an hour later i started feeling pain in my belly button

Tension/Anxiety: Stress is associated with anxiety and mood symptoms, in your case these two symptoms, nausea and abdominal pain are symptoms of that. Other symptoms may include dry mouth, sweating, diarrhea, tingly sensation, hot flashes and chills. Mild anxiety can be addressed by therapy and self help. Moderate to severe , on the other hand may need a combination of the above with medication.