I do not want to scare you but the symptoms that you have mentioned- fullness in ears, Sinus pressure, Difficulty swallowing, slurred speech and dizziness suggest of a brain tumour
. Unexplained chills without fever and hot flashes are due to a hormonal problem. The brain tumour
could be the cause of this as well. If the tumour is compressing or affecting the Pituitary gland, hormonal imbalances may occur due to abnormal secretion of the thyroid stimulating hormones.