Hi jesse!
Your support and love will go along way towards helping your husband adjust and cope. My seizures arrived when I was 35, just
after I'd broken up with my long-time boyfriend. So in my case I turned to friends and family to help, and they came through in different ways -- checking in from time to time, letting me vent and think aloud, coming with me to appointments, driving me around as needed. I especially appreciated that they didn't treat me with kid gloves -- for me, their being matter of fact helped me feel more grounded about what was going on.
Based on my experience, I would say that it's normal for your husband to be scared and worried. It can take a while to adjust to the idea of epilepsy and also to feel confident in how your body and brain are behaving. I've found that it can help to do progressive relaxation exercises in bed before going to sleep: Slowly tensing and relaxing one's muscles starting with the toes and working on up to the neck/head/face. Ideally the exercises should be accompanied by "belly breathing" (see
https://en.wikipedia.org/wiki/Diaphragmatic_breathing) with longer exhales than inhales, but if that seems too complicated, one or the other is fine to try.
You should encourage him to ask for help if he feels like his anxiety is getting out of hand. Your husband's neuro or regular doctor can refer him to a therapist -- worth considering, even if he's never been to one before.
If your husband is on anti-seizure medication, there's also the possibility that it could be affecting his moods or his sleep. It can be hard to tell, but if you think that might be a factor, he should make a note of it and let his neuro know.
Best,
Nakamova