Th Er may be helpful for many thing, such as pain control for Crohns, if you can get them to beleive you.
You need to get to a GI now, get The Prometheus test or inflamation tests done....
Even if they cant find the "smoking gun" persay, Many Gi's are smart enough to diagnose crohns and get you started on one or more of the meds that will help with it if the symptoms match.
Don't hesitate, to get to A GI specialist, use the er if you have to, and pain is an excellent reason to, dont let the hospital convince you to give up and stay home in pain with potential mis-diagnosis, get the testing from a real GI and force them to find the truth.
Dont give up, I suffered greatly in the beginning, once we figured out what it was, I have been able to gaina much greater control of the diseaes through the Doctors help as well as my own extensive research online, like this forum for example, excellent source for info, advice, compassion and family.
Thanks
Jon