When one refers to metabolic syndrome they are generally referring to a syndrome of insulin resistance, increased abdominal obesity, and often elevated blood pressures along with several other characteristic findings. This syndrome is generally not associated with seizures.
If, by chance, your neurologist was referring to a different metabolic disorder, there are several metabolic disorders that can present with seizures. I am not familiar with a metabolic disorder that would present at age 35 but this is not my area of expertise.
I would recommend you continue to follow up with your doctor to figure this out.
Advice and opinions given are based on the information provided and must not be considered an official medical recommendation. The limitations of the internet prevent an appropriate evaluation. Always consult your doctor if there is concern.