How would you handle this......please help me?

so this girl (Lauren) i met over 2 years ago and have been dating for almost 6 months now.she is AMAZING! probably one of the most amazing people you would ever meet. Lauren suffers from Pulmonary Hypertension and this past year her PH has gotten worst. (pulmonary hypertension is where you have high blood presser in your heart making it difficult to pump blood into the lungs to become oxygenated. she can barley walk from cl to cl without getting to tired. it is not only rare but incurable and life threatening.) for the last week she has been in the hospital because of her PH. Seeing her in the hospital, makes me feel horrible i cant take it. its not fare that she has to go through this. I honestly don't know how much longer i can take it. I don't know how to be there for her. how would you be there for someone that is going through something like this?