What causes chronic diarrhea, nausea, vomiting, dizziness, fatigue, insomnia, fainting, full bowel movement in sleep, headaches, eye pain?

Viral syndrome: Other than the "full bowel movement in sleep" what you are describing is consistent with viral syndrome which requires rest and hydration and should not last more than 5 days. Avoid dehydration as you are losing water and it will make symptoms worse. make sure you eat and keep activity and environmental exposure to a minimum until you recover. Let your doctor know what is going on.