I see, you have had the Gynae scans etc. I am sure if anything was amiss, it would have been found.
But it's easy to feel a slight nagging worry especially if there's a tendency to anxiety. Sometimes we're happy to accept findings...until we get another bad day or flare up, then it feels so bad we can't help thinking "what's going on? Maybe they missed something!"
I get more of what would be described as "discomfort" on the lower left as a general thing. The period-like cramps seem to happen more in flares.
That discomfort feels like a heaviness, or dullness down there, and goes along with some bloating in lower abdo. It feels rather like there is wind wanting to come out, but nothing or very little happens.
Mine also comes on for a few days then disappears for a while.
I kept a symptom and food journal etc. And I have been weeks/months without that feeling. Then it would come back for a few days, go away, sometimes return, and then disappear for another while.
And there is literally nothing I can trace which causes it!
For instance, I had it most of the week before last when I was a bit 'loose' every morning (5 on Bristol scale). But last week it disappeared, and guts were pretty normal too (bm's) even though I was eating broccoli, seed-grain bread, brown rice, sugar snap peas, cucumber and had some chocolate!