Your symptoms could be due to Celiac disease, but the colonoscopy didn't revile positive results associated with this disease.
IBS can give morning rushes to the toilet with abdominal cramps.
Abdominal pain with diarrhea, nausea, weight loss, hot flashes can be due to untreated diabetes.
So, check the blood sugar level.
Test your thyroid gland hormonal status.
Talk with your physician about hormone-secreting tumors (they can be located in different places in your body and give symptoms like diarrhea and hot flashes)
Best wishes!
Marija