Think i had a ext. ehemorrhoid. think it may have burst. now i am feeling a lot of pressure and protruding when needing to poo! has it damaged my anus?

No just feels like: The hemorrhoid will heal slowly heal over the next couple weeks, warm sits baths will help keep the area clean. A pad to absorb the drainage will also help. Psyllium (metamucil ) daily will hep prevent recurrence. Avoid sudden straining and heavy lifting. If not better in the next 7-10 days see a surgeon.

Unlikely: Sounds like hemorrhoid prolapse. If you need to "push back in" your hemorrhoid after a bm, it is time to see your doctor. You may need surgery.