L am seven days post-op haemorrhoids

l am seven days post-op.I was discharged second day after the op. I was given antibiotics, metadol, duculux and advised to take sitz baths. I emptied my bowels the morning after the op. it was the most excruciating pain in my lifetime. I sweat, felt nausea, dizzy and almost fainted. I squated to empty my bowels and subsequently I realised it was the first mistake I made . I realised releaving myself when standing wasn't as painful. when I got home I went on with medication with frequent visits to the bathroom. the stool was mostly mucoid n urgent. on the day following I noticed a swelling which felt like a haemorroid and was painful. meanwhile, the metadol was taking a toll on me.I had difficulty breathing and I felt too weak.the spasms were too intense and the doctor never gave me any muscle relaxers. I couldn't sleep. I stopped taking metadol and took diclofenac instead. the swelling reduced as well as the pain. I was now able to move freely without the effects of the tramadol n metadol. when I visited the surgeon, he told me the swelling would shrink with time. he also told me that he left one haemorroid behind to avoid stenosis. I don't wish to go through another harrowing surgery in future. Am wondering could that one haemorroid worsen in future and trigger more haemorroids? I have had enough of this and I don't intend to take that route again.