Since Friday Evening I've Because Very Tired And Slept 14

Since Friday evening I've because very tired and slept 14 hours Friday and got up Saturday morning feeling I'd not been to bed, this as happened for the last two evenings. I've not been able to eat because I feel sick after food the because I'm hungry I try little and often but can't keep my food down.my heart when I'm on my feet feels light it's beating fast sometimes not all the time. The only time I don't feel sick is when I lay down