Deductions

After taking Stella to the hospital and a series of check up were conducted on her, and was told she's physically fine, but not sure about her mentally.

Alex nearly had a heart attack when a psychiatric hospital was recommended. He controlled himself and try not to give in to it.

He was told to be mindful of his health. His body is at risk. If he stressed it too mentally or physically; it might results to his death. 

According to the doctor; she's either sane and locked herself in her own body, due to a shock, or her unwillingness to face reality.

Or she has gone insane.

The best option is to visit a psychiatric hospital, as it's not something that concern physical health for now, and surely not something they can help with.

Without any other choice; Alex did as he was told. It's been a week after the incident. Alex was now sitting in front of the psychiatrist in charge of Stella, who was still the same.