student visa expire.

[Foniseti]

I came here to the United States on a Student Visa. I came to school in BYU-Hawaii in 2009 in July. During the time I was at school I was really sick. This is about after four months I was still at school. I was rush to the hospital and found out I have a heart problems. The Doctor said they will do an open heart surgery to replace a mechanical valve because on of my valve is very wick. I was at the hospital for the operation and went back home to recover. My Doctor write a letter to the school mention that I won't be able to attend school until I recovery. At this time I was out from school trying to recovery I get a chance to come here to Utah. In 2010 I was still recovery and I get a chance to see my heart doctor here in Salt Lake City to check my heart and also to check my blood every week. During this time I trying to recovery in 2011 I became really sick again and I was rush to the hospital for another open heart surgery. My heart Doctor here in Salt Lake City at the Intermountain Hospital said they will remove the mechanical valve that were replace in Hawaii and put a pig valve and fix another three other valve. They also do a surgery for my leg so the blood can float it well. During my sickness I didn't have a time to complete my education. I was planning to complete my education so I can get my Bachelor's in Accounting but I didn't make it and my visa expire due to my sickness. How can I renew my visa in order for me to go back to school or Is there any other way for me to get a green card due to my sickness?