For the last few weeks, i have had a strange feeling in my rectum/ anus. It feels like some pressure or fullness like there is something there. I'm worried about it and keep thinking it might be a tumour, I'm trying not to go to the doctor as I suffer from health anxiety and am worried that maybe me worrying about it all the time is causing it to be there. The only other symptom I have is a pain in lower back right above my bum when i move from standing to sitting or vice versa or when I sit on a hard chair or seat. So in my head I'm adding the two things and coming up with bowel cancer. I dont have bleeding or problems going to the toilet.

Has anyone else had anything similar and know the best way to deal with it?