It isn't limited to this. Anytime my local doctors can't find what is wrong, they resort to the "It must be your imagination" bit. I have heard several people complain about it, not just me.
I wonder how many people have died of their "imagination"? I just wish they would have the guts to say they don't know if they don't.
I have so far out-lived two doctors who had treated this condition and I'm starting to wonder...