I doubt I can help much...but I am wondering where in your left side the pain was? I wonder if the pancreas might be involved?

What blood work have they run? Besides the WBC and liver enzymes?

Have you done any allergy testing or enterolab? Do you have abdominal/gi symptoms beyond pain?

And are you female? Endometriosis comes to mind (the theory that it might be growing on my colon has been tossed around, and that would fit your symptoms somewhat.)

What about parasites? (just grasping at straws...the blood count sounds like an infection somewhere. A parasite could cause an infection, or mimic one?)

I wouldn't be quick to rule out gluten or other food intolerances. I have met so many people online who discover that seemingly unrelated conditions are cured when they remove some common food from their diet.