gastric/rectal burning pains?

I am getting pains in my rectal area which can radiate to my testicles and penis. It usually occurs about 30 minutes after a bowel movement and can last anything from 30 minutes to many hours.
I am awaiting an endoscopy as I was having discomfort in my oesaphagus, and I’ve been taking Zoton 30mg for the last few months which, stops that discomfort, so long as I keep taking it. I believe I have acid reflux but there is the small possibility of an ulcer too.
The rectal pain, feels like it’s in my colon/rectum/anus area mainly. It’s quite a burn like pain. Very hot feeling. I’ve been thinking it may be a fissure or hemmoroids? Anyone have any ideas? Thanks.