I lose my balance, fall, feel light-headed and sometimes faint. had a heart mri, brain mri, blood tests and all came back normal.what's up?

Balance: Falling is a concern because it can lead to injury. If lots of tests do not show the reason, it may be a medication you use. Side effects of some medications include imbalance, and that would not show up on any tests. There are other possible causes that will not show up on MRI also. You should consider a movement disorder neurologist, as they also have experience with many balance disorders.