Why did Jesus cry out in Aramaic whilst on the cross?

Because when people are under severe stress or pain they revert to their mother tongue. Jesus drained the cup of rejection to its bitter dregs. Physically He could have lived several hours longer and crucifixion by it is nature is an execution method to provide a slow, tortuous and painful death, but Jesus died of a broken heart. 

What broke His heart was the ultimate rejection! Forsaken by His Father so we could be accepted completely.Jesus bore our rejection, all of our shame, our embarrassment, betrayal and heartache dying of a broken heart. We are accepted because of His rejection. We are accepted in the Beloved. Jesus bore the evil that we might receive the good. He carried our sorrows so we might receive His joy.