The ER usually doesn’t do a big work up- they are trained to care for acute problems and will send you home if your vitals are good.
However, it would be nice if they recommended a particular department in the hospital.
Did you have all testing done through ER or your own doctor?
You could get an appointment with a gastroenterologist at the University Hospital- your primary care doctor can refer you and send along all information so far.
Even if you had a lot of tests done, some may have to be repeated.