@jaderm
Like @santosha I have no Thyroid or VNS experience but am interested in your Epilepsy.
You mentioned “My vitamin d levels have been low for along time”
Low vitamin D is common in epilepsy patients taking seizure medications. My seizure meds ares enzyme inducers which interfere with vitamin D. My mom had Thyroid problems and her doctor put her on vitamin D supplement so you might so it’s no wonder you D is low. Do you know what your level is? Have you discussed if your meds are responsible for your low D level and if you should supplement?
What seizure meds are you on? Has the I see the VNS helped your seizures. How long have you had them and what type/s.
Jake