Thank you for posting this!
My doctor and I are looking at this for myself right now. I had tests done at the hospital last Thursday, due to unbearable pain in my side and back and shoulder. My doc sent me to the hospital after he examined me. But, nothing showed up on the CAT scan, ultrasound, exray, bloodwork or urinalysis!
They sent me home with pain killers.

The pain went away a few days later, but, it's back today. Of course, it's a holiday weekend, and no one's around, so, it's just me monitoring it. Not too comforting. I'm hurting now. What started as a slow, burning type pain today is now deeper and more painful with occassional sharp pangs.

So, I'm scared.
I've had surgery before. I don't like it but, I'm not afraid of it. But, I just don't want anymore.
And I'm afraid to take the pain killers cuz it will dull any pain that may be telling me to get to the hospital!

Wish I knew that it was definately gallbladder, and knew what to do right now. I'm not a happy puppy about now.

I look forward to hearing more from you about how you're feeling now....

Peace!