Paula,
Yes, inflammation and pain are typically associated with chronic issues. And yes, there are almost no nerve endings in the epithelia of the intestines. There are however, nerves in the serosa (the outer layer of the intestines, which is supported by, and interfaces with, the mesentery).
As you know, I hate to disagree with a doctor (

), but while that statement is generally true in chronic issues, I can easily prove it to be incorrect in general. For example.
What happens when you burn your skin? It instantly hurts like hell, even though it takes a few more minutes for the inflammation to develop.
What happens when you cut your finger? Same thing -- the pain is instant, even though absolutely no inflammation has had any time to develop (that comes a few minutes later).
What happens if we slam our finger in a door? Same thing -- the pain is instantaneous, even though it takes several minutes for the inflammatory process to progress to the swelling stage.
So what does this tell us? Pain is a result of sensory perception by nerves (as your doctor correctly pointed out), but no inflammation is necessary for the initiation of pain. The pain comes first, and the inflammation follows. (And yes, the inflammation and it's symptoms causes additional pain to develop, but this is secondary pain, not primary pain. Primary pain comes in response to instantaneous nerve stimulation, and it it occurs, well, instantaneously. If we had to rely on inflammation to generate enough pain to prompt us to pull our finger out of a candle flame, for example, our finger would be severely damaged before our brain ever realized that we need to move our finger away from that flame. Fortunately, we respond almost instantly, because pain is primarily a sensory nerve response (rather than a response to inflammation).
So will Inflavonoid help to suppress pain?

I certainly won't say that it can't do so, because anything is possible, and the placebo effect is very powerful. However, if it were a potent pain-reliever, I have a hunch that we would all be using it, already -- we wouldn't be just now finding out about it.
Incidentally, there's a gap in your doctor's knowledge about the issue of intestinal pain. Theoretically, if there are no nerve endings in the mucosa of the intestines (as your doctor correctly pointed out), there could be no pain perception, regardless of whether or not any inflammation existed. Therefore, using that line of logic, treating the inflammation would have no affect on the perception of pain.
We know that's not true, however, because we know that pain does exist with this disease, and we know that controlling the inflammation does reduce any pain that might be associated with it.
Inflammation is also associated with (and essential to) healing. Have you tried L-glutamine? It's known to promote intestinal healing. As the damage heals, the inflammation will fade away. Trying to suppress inflammation without promoting healing is an exercise in futility, because tissue damage cannot heal without inflammation. Therefore, the key to treating an IBD is to promote healing, rather than to just suppress inflammation. That's why we promote the diet over drugs -- because the diet interrupts the inflammatory process by removing the source of the inflammation, and it allows the intestines to heal naturally, by letting the inflammation run it's course during the healing process. That's also why corticosteroids actually retard healing -- because they suppress inflammation, without promoting healing.
Tex