Diagnosis can take some time to get done. If you can arrange an appointment with a specialist on your own without a doctors referral, I would advise it. It took me almost two months to see a Gastroenterologist. You can call around and see who may be able to get you in sooner. If you trust your doctor, then it may be best to wait & have them recommend a Gastroenterologist they trust.
Disclaimer: I am not a medical professional. Using this information is at your own risk.