How do i cope with an epileptic who has sleep apnea?

My partner was recently diagnosed with epilepsy. After witnessing all three of his seizures I'm pretty scared. He also has sleep apnea which is the main cause of his epilepsy. At this point, I'm too scared to sleep. Considering he had his seizures in his sleep and he always stops breathing and the twitching I'm so terrified. How do I cope with this. I haven't slept in weeks. I know he gets annoyed with my constant worry so could someone please help me?