Have your hemorrhoids gone already? Do you always eat meat? Most major causes of hemorrhoids are unhealthy eating. So, the basic thing is to change your diet. Include more fibre and water, less meat, and never sit on the toilet for too long, avoid drinking smoking, and more..Some home treatments you can try
Internal hemorrhoids may trombose and then they itch and cause pain. This pain would be felt inside the anal canal, and bms would hurt. But this wouldn't cause diarrhea.
Frequent urge may appear if ulcers would develop in mucosa over hemorrhoid. Ulcers could be from inflammation like Crohn's disease, but if nothing was seen on colonoscopy, then it's not likely.
Other causes are non-absorbed bile or fatty acids (from small intestinal malabsorption). This would go with lose stools.
Itching around the anus is often from candida.