Hi there, the abdominal symptoms you mentioned could be part of irritable bowel syndrome
. It is a disease related to the function of bowels. It is usually because of stress and no lab test is abnormal in this case. It is accompanied with anxiety
and stress and so also with sleep problem. Ask your doctor to see that could be true for your case and about the treatments which are mostly non medications, like more vegetables and stress management
. I wish you a good health.