Hi. Did you have a stool culture for a possible infection done and did you have an H pyloric screen for a possible stomach infection?
And were you checked for pancreatitis with a serum amylase and lipase test?
I fully understand Kristina.
First off, this could still be a gall bladder problem even if you don't have stones. It's called a dysfunctional gall bladder--one that doesn't empty properly--and it takes a HIDA scan to look for that.
However, I have other concerns. You absolutely need the stool culture for infections and with blood in your stool you need a colonoscopy to look for a possible infection or perhaps inflammatory bowel disease like ulcerative colitis.
You may also have an H pylori infection in your stomach so you need screening for that.
Finally, although I don't think this is pancreatitis you need your serum amylase and lipase levels checked for that
Let me know if you need any more information here