I have extreme fatigue, brain fog, complete shortness of breathe and go bright red in the face from small amounts of activity, frequent bowel movement, phlegm/a cough for 4 months, body/joint pain, pain up the side of my face, neck and ear. I have also began to completely lose my appetite and sometimes it hurts to swallow. I have swollen lymph nodes and a burning feeling on roof of mouth. I have blood in stool sometimes and pain in my ears. Could this be thyroid cancer?