i went to dr. feeling very tired and sluggish, and short of breath all the time. he said my thyroid gland was swollen in my neck and did some blood work. both t something levels came back very low and he sent me to an endiocrinologist? to be seen by him. he did his own blood work and i go back next wed, but he did say that it could be something minor but he also said it could be something in my head with my pitutary gland not working right. no one has mentioned cancer so im not really worried about that. i am also lightheaded pretty often and have quick sharp pains in my head, but not really headaches. what might it be?