Flossy, I know you had mentioned using enemas at one time. When I was having bad IBS-C issues, I found that a plain water enema sometimes helped if I felt like I was close to having to go, but nothing would come out. It was a bit of a gamble, because if it failed to cause a significant movement, it was apt to make me feel worse.
I seldom use water enemas anymore because I have more issues with D than C nowadays. As an aside, it was the strangest thing. Over time, I was having worse and worse issues with constipation. It culminated in a situation where I was pretty much never going. I would combine Miralax and a senna laxative, and still not go. I probably hadn't gone for 2-3 weeks, when it got so bad with severe constipation and nausea that I went to the ER out of fear that I had an obstruction. I didn't, but I was backed up, so they told me to take a dose of magnesium citrate along with stool softener. The magnesium citrate made me feel really horrible and didn't cause any significant bm--just some liquid came out.
Finally, I had a bout of severe cramps and D. After that, my IBS changed to where I had alternating C and D.
I certainly wouldn't regard this as being "cured". I continued to have bad IBS issues that I believe are only somewhat better now because I take Miralax daily. But to be honest, I would rather tend more toward D than C, so I feel your pain. Plus, I found that getting a bidet toilet seat attachment reduced the severe irritation and hemorrhoid problems from excessive wiping.
I always use 100% aloe vera gel (mixed with a little bit of cocoa butter lotion) to wipe with. Works really well down there.