Oh What to do...

I'm posting here because I am having trouble deciding what i want to do career wise. I am a new grad and have been at my position within a critical care department for about 7 months now. I signed a contract to stay with my hospital for a couple of years and was picked out of many to get this job. However, the stress and the lack of sleep/eating has caused me to feel both sick mentally and physically (totally miserable!). To boot I moved for this job and am missing my home base. I took some time off from work and am now considering to give my notice once i go back. I feel odd about giving notice because i was one of the few selected but at the same time, i feel myself getting sicker.

Here are my concerns: 1.) Is it advisible to resign and break my contract? (Granted I believe i will have to pay penalties) 2.) Will i ever find a job path? (I say this in this way because the job market is so bad and am concerned that if i leave i wont find a job for a long time). 3.) What do i tell my employer as to why i'm quitting? (do I say im leaving for medical reasons? this would cause probs with other jobs..)

Any constructive feedback would be appreciated. It just makes me all nervous!
Hi I suggest that take a break from your work for some days and relax and think twice before quiting it.Its not a good decision to leave this job.When you are starting your work it happens to almost evrybody,but dont get frustrated and gain experience in this field which will be very helpful in your career for more better opprtunities.Be patient and keep mum and go with the flow.Rest is your decision but I suggest dont quit it,