Fulness in ear, followed by severe diziness/weakness, follow

I am a 30 male who was diagnosed with Marfan's Syndrome about a year ago. I had Aortic Repair surgery about 6 months ago to repair 2 aneurisms in my ascending aorta and arach. Since then I have been experiencing attackes that start with a fullness in the left ear, followed by severe weakness/diziness, followed by tinutus and then it all goes away. These attacks last about 5-10 minutes and happen about once a day at different times. I have seen my cardiologist, an ENT and a neurologist, none of which has a clue what is going on. Anyone have any suggestions???? Thanks!