@jaderm
Good question to ask your Neurologist.
I don’t know much about thyroid except that hyperthyroidism can cause generalized seizures although I don’t know how frequently they occur. My understanding is that fainting and thyroid issues are quite rare but that's not to say it can't happen but the cause of seizures is abnormal electrical activity in the brain whereas Syncope is generally caused by sudden drop in blood pressure, which causes a drop in blood flow to the brain. Obviously, there are other causes too. Let us know what the doctor says please. My guess is that it's not associated with your seizure disorder but it's only a guess. How many fainting episodes have you had? I had a fainting episode in the grocery store a year or so ago. My heart was monitored for six weeks afterwards. The doctors didn’t associate it with epilepsy however they were unable to determine its cause.
Seizures definitely can change over time. In the beginning at age 14 I had absent seizures although it wasn’t too long before the Tonic-Clonic seizures began and Status Epilepticus. Then about 35 or 40 years later the Focal seizures started but not many compared to the Tonic-Clonics. some years later I had an aura, it was the first one I ever had or at least that I remember having and finally at age 59 for whatever reason my seizures all stopped, for the most part provided I take my medication. It's been 15 months since I had one and for me that’s an eternity.
Take care of yourself,
Jake