I had and continue to have the same problem at times; that is why I only use prep-H wipes, A&D ointment not cream after every movement and my GI gave me a prescription for suppositories. I tried the prep-H over the counter ones and they didn't work either; it was driving me CRAZY! This method has really worked for me, the suppositories are hydrocortizone based, maybe you can check with your dr.
I also read your other post about your sharp pain, make sure you have it checked out if it continues but you could have also broke away an adhesion or have a tear that needs healing; heat usually helps the most, I can't tell you how many times I've used my corn bags; my microwave is about worn out lol. I hope you feel better soon.
I don't know if you read my post on the colectomy 22 site but I'll make a long story short. I went in on the 7th for my kidney stone removal & came home on the 9th, told dr wasn't feeling well, abdominal pain, started diarrhea in hospital, he said probably part of surgery. Started vomiting on way home, diarrhea x's 20 the next day, called him 3 more x's saw him on Mon., he never examined me just ordered a CT scan, they couldn't do it for later that night, by then still severe diarrhea, extremely bloated and extreme abdominal pain. Office called next day and said to come down right away bc my bowel was dying and I needed to see a surgeon. I said I was going to my colon surgeon so we went 3 hours away. My GI dr did a scope didn't find anything except severe inflamation and dehydration. Put me in hospital under surgeons care called next day to say I had c-difficile infection caused by too much antibiotics from kidney surgeon. Luckily I didn't go to that other hospital bc they would have aken out the rest of my colon and given me a permanent bag. One dr told me that I almost died; I've never been so scared or sick even when I had pancreatitis. It's a slow healing process, but I'm starting to get better . I'm so grateful for my drs and their knowledge.
I hope you can get things worked out and remember to never let a dr over medicate you, our systems are a lot different now.