I've had IBS for several years, and am having a very bad flare up at the moment (for the last week).
I'm taking medication (mebeverine), which is helping a bit, but I'm still in pain.
I could go to a walk in, but I don't really think the doctor will be able to do much, as I am already taking the medication, and IBS is one of those conditions that doctors don't really understand and have difficulty treating effectively.