What is it with doctors and women. It seems as though someone suffering from the fatal 3Fs (Female, over Forty and Fat) can't get any doctor to listen.
In your case, CHANGE DOCTORS - at the very least, find someone to get a thorough examination and second opinion. Do it ASAP.
I had lymphoma (similar to leukemia in that I had to have transfusions, etc.) After chemo my bloodwork became normal. About six months later I started coughing - complained to my doctor - he kept saying "Your bloodwork is fine, don't worry, it's your imagination." Couldn't get him to listen.
Six months later started having severe stomach pains. I went to see a different doctor - his instant diagnosis "Acid Reflux". He put me on Pepsid.
Three months later had to have complete physical (took DH with me). Again, complained of cough, no relief from acid reflux, etc. DH insisted on chest x-ray. Turned out I had lung cancer and masses in my abdomen.