I've been tested twice a year for the last 4 years and my doctor said it is consistently one the lowest level he sees (usually in the 5-6 range) and I'm on a dose of 50,000 units of D2 weekly. I also have Celiac so I have absorption issues with vitamins. Usually have at least 2 complex partials a week and some simple partials in between. So far they are intractable after 3 medsNo one has said there is a connection but now I am curious...
Are you aware seizure is a symptom of Celiac disease? What have you been doing in attempt to cure Celiac disease? There's a lot you might consider doing other than the gluten-free diet which is often high carb and sugar and may actually feed the problem.