The Marfan Syndrome?

I am very worried about the Marfan Syndrome. I have had 2 doctors in the past ask if I had ever been diagnosed with the syndrome, the first was because the doctor noticed my class 3 jaw ( I am due to have surgery on this) as far as I am aware this is not a sign of Marfan's the second doctor said it because of my height and slimish build. I am 22 years old, 6 ft 2 inches.

I became so paranoid about me having this that I saw a cardiologist who performed an ECG and echocardiogram. Both came back clear, he said the valves were normal and the cardic structure and function were completely normal. I do not have a deformed chest, my sternum is every so slightly indented. No one in my family has ever been diagnosed with Marfan's. My brother, cousins and uncles are all around my height.

I feel as thought I am being victimised to an extent as doctors seem to be judging me on my height, which I don't think is THAT tall anyhow. I am not hypermobile, do not have flat feet or exagerated arches. I think my palate is a little high but it is not arched at all ( asked a maxillofacial surgeon).