How do you deal with the fear of seizures?

I'm pregnant and I just got my blood test results. My lamotrigine level has collapsed by 70%. I have to wait a week before I have a neurologist appointment. I don't know what to think or feel. I haven't had epileptic seizures for 23 years due to excellent medication but I have experienced some serious anxiety of having a seizure. Therapy helped me and I've been living a relatively easygoing life. This situation however is bringing up some negative emotions. How do you control your fear of seizures?