What Causes Pain In Lower Back And Abdomen Along With Fatigue?

I have some symtoms that make me very concerned. Lately I have been very fatigued, pain in my lower abdomin and lower back, shortness of breath, coughing with tightness in my chest that comes and goes(this system mybe allergy), Yesterday I visited the doctor and he told me my hemoglobin was low. (9.9) He urged me to schedule an appointment with my OBGYN right away. They can not see me until April 29th. Today I think I saw a little blood in my stool. Should I go to the emergency room?