Doctor appointment today

So, I went back to the doctor for a follow up about the B12 shot.  I had my first shot 2 weeks ago and it was supposed to help with my fatigue.  Yeah right.  It didn't do anything.  I still have all the symptoms-coughing up stuff, sinus headaches and pressure, burning eyes, runny nose, no energy.  Today, doc thinks I have some underlying allergy and wants me to go back to the allergist.  Even though the allergist said I have no allergies.  I have all kinds of allergy symptoms but no allergies.  I got another B12 shot today hoping that I notice a difference.  I have another appointment in 2 weeks for follow up and another shot.