Hello, I am a 25 year old woman and lately I have been feeling fatigue, having shortness of breath, pounding headaches and sweating episodes when the room is cold. I have had blackouts before during my teenage years and a few seizures when I was a baby. I even had severe pneumonia when I was around 12 years old and was hospitalized. Now, with these symptoms, what do you suppose it might be? Your help is appreciated. Thank you.