Dilantin Sleep Apnea, Go to Sleep, Acute Bronchitis, Petite Mall, Grocery Store

I have been on dilantin for 11 days, due to a grand mall seizuire at the grocery store. I also have MS and sleep apnea, I don't know if it is my fear of sleeping, or that I have insomnia. I can't go to sleep until 3:00 a.m. but I find myself very tired during the day. I have found that food turns me off, and I have to eat something I'm really hungry for or not eat at all. I had to go back to the ER because I was dehydrated and acute bronchitis and possible petite mall seizure. My dilantin level was 3 and was told it should be at least 10. I was on 200mg, now on 300mg. Anyone know what proper amount should be (is it according to weight and height) Does anyone else have MS with their seizures
Paula