Advice needed - New Member

Hi, i'm not sure if this is the correct forum, if not, my apologies.

I need some advice.
My twin was diagnosed with Delirium, he has cerebral palsy and is 22 years old, this happened last month for the first time, he produces music and is up at nights, lack of sleep. He is on respiridone and another drug to help him but it barely works, he also experience sundowning at times. This has been going on for about 6 weeks now, he also spent two weeks in the hospital, he sees people that are not there, hear voice and is paranoid at times, how long is this expected to last, he did a spinal tap, CT scan and blood test all revealed that he was okay, his feet are kinda swollen and he is to do an MRI soon. Some level of advise or recommendation would help. Thank you