Just got admitted... I really need some advice :(

I'm a 16 year old male who just got admitted to the hospital for a low heart rate. It was in the 30s. I dangerously under ate ate about 800-1200 calories. I lost about 60 pounds in 9 months. Despite this my BMI is healthy, at right around 18.6. I'm afraid because I was a very active athlete who exercised at least an hour and a half a day. I now can only sit here and do nothing. I'm so afraid ill never be able to work myself back into shape once I leave and I'm afraid they are going to turn me into a huge butterball again because my metabolism probably sucks. Any advice from personal experience?...

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