Getting enough rest and eating healthy foods to maintain a healthy immune system

Yes, it helps support your immune system. 

True. if you have 4 or less hours of sleep each night it will weaken your immune system. If you have 3 straight nights, no sleep whatsoever, you will die of exhaustion. This has happened to a person who spent a whole 3 days straight, no sleep whatsoever, and died because of exhaustion.  Eating healthy foods, such as fruits, vegetables, and nuts, will also keep you healthy, and keep your immune system working and healthy as well. Fruits nuts and vegetables have humungous benefits. Fun fact- Cucumbers can help with sore throats. Hope this helps.

Go to the doctor and they can determine if u really broke it or not