Hi Mike
I hope you are doing better. I had a partial haemmorhoidectomy and experienced the same pain as you after the surgery. It's the anaesthetic that slows your body down and makes you constipated as well as the pain killers. I had to take a herbal laxative after 5days of agony and no BM. The herbal laxative is called senakot and worked well.
I found the nurses unhelpful when I rung them although they were patient i don't think they understood the pain I was in.
Really hope you have a speedy recovery