I write this post in fear of what may come but looking for answers. I have for now five weeks had trouble sitting with a weird feeling inside my rectum. It feels like I have a pea inside my anus which makes it difficult to sit for more than five minutes. I also get occasional burning which is maddening and tests my nerves to the limit. Where is the best place in the uk to test too see if I have the possible nerve problem as colonoscopy an other tests are all clear. I look forward to any advice.