I hope you have been able to get some relief with dihydrocodeine. My IBS specialist and I have tried every medication that we could (allergies and heart issues makes some not an option) and nothing worked. It either made no difference or made things worse.
Thankfully, up here in Canada, medical marijuana is legal and has saved my life. I actually just finished consuming some Chemo, a strain made by David Suzuki (yes the nature guy) for cancer patients, because my IBS pains were so intense I was either going to pass out or throw up. There is still pain but it's gone from a 10 to a 3.