Luna,
Im not overly familiar with OI.
A brief literature serch revealed some evidence of valvular dysfunction and a case report of aortic aneurysm with the disease.
A lot of different things could cause the symptoms you are describing as they are relatively nonspecific.
I think a thorough history and physical with yoru physician would be a reasonable start to help guide what the next step would be.
good luck. keep us updated.