Thanks for the query,
Your opacity in the heart detected by X ray
need further evaluation by either CT scan/ECHO test to confirm the exact cause so that we can guide you and let you know if this is related for your seizures or not. For seizures, you can meet a neurologist
and get evaluated with clinical interview and investigations like Electroencepohalogram (a test which maps the brain function and tells if you have seizure activity in the brain) and MRI
scan of the brain. This will establish the cause of he seizure and so that your treatment becomes easy.
Hope this helps