I am so sorry to hear that your grandpa is going through this now.:(
I am certainly sending my prayers that this is something benign/treatable...and that he will soon be discharged to go home.
I am sending positive thoughts and prayers you way as well, as you are naturally worried.
Let us know how he is doing when you can!
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"
"Worrying does not empty tomorrow of its troubles...it empties today of its strength."
Corrie Ten Boom
Panic Syndrome recovery due to CBT