That's terrible with all you had going on that you didn't feel like they were listening to you. The first time I went to a doc about this was right after I had my daughter, 2 years ago. When I initially tore (I also had a fissure after I had my son but no one caught it and it healed after a long time and there's a tag there now) I went to a GP and I told him I thought it was hemorrhoids and I explained the pain, etc. He did a check and it was excruciatingly awful and I spasmed for 24 hours from his fat finger
the next time I went was after a week long stomach bug and constant diarrhea but I went to a gastro that specialized in hemorrhoids. Thankfully he knew just by looking at my face and the amount of pain I was clearly in, that it was most likely fissures. I was lucky to have him listen and take his time with me and even luckier that he referred me out and didn't do a trial and error with me for too long. My CRS has been very nice, informative and open with me so far. I feel really lucky to have found great doctors.
They've told me to stick with colace and miralax if I feel like i need it. Colace is gentle on me. Miralax makes me super gassy but helps the consistency without being too forceful. It's amazing to me how much thought can go into how our poops are lol. Even moreso for you MPB I'm sure
how far out are you from your LIS surgery? How do you feel now that some time has passed?