If you had gallbladder / gallstone problems (either during pregnancy or not) what were your symptoms, and how did you get diagnosed?

Three times now I've had seemingly random days where I woke up early with diarrhea and extreme stomach pain. Two of the days I vomited. The stomach pain is cramping/stabbing. Yesterday's episode was so bad that I went to my doctor (PCP) who said "meh probably a bug" and gave me paperwork to get a stool sample and bloodwork. I ended up being in so much pain I went to the hospital instead where they basically said the same ("gastroenteritis?") And told me it was not a gallbladder issue. The only testing done was a urinalysis and a finger prick for blood glucose.

After talking to a few ladies on here I'm not convinced that's the case. I am literally living in fear of having another attack- the stomach pain was worse than 70% of my labor. I'm 36+3 right now which makes it even harder to deal with that kind of stuff!

Advice about symptoms/testing is welcome. I plan to discuss in detail with my OB on Friday at my appointment.