I've had this issue since November too.
Ultrasound found 1 or 2 stones or polyps. Then I was sent down the gastro route. All clear.
To be honest, mine is morphing into different things at different times. Right now I've got terrible reflux.
So, to be honest, I think mine is just a symptom of my terrible peri fluctuations. Not that any doctor has ever referred back to me on the gallstones.
At one point, around march, I was adamant if was the gallstones. Now I don't think if is.
Like you, I was never in extreme excruciating pain. More constant discomfort.