How Can Severe Depression After Attempting To Commit Suicide Be Treated?

Ok my bf tried to hang himself but i saved him and did cpr not sure how long he was with out breathing he s been on venilater for 12 days had problem with kidney and lungs but was able to be woke up his MRIs and cat scans showed great n had no damages to neck or anywhere else but he s woke up not answering questions well he will shake his head to somethings he s not talking he crys n sobbs so he s making noise some but want talk n doesn t seem to recognize his grandma he seemed to know his brothers voice over the speaker phone but started crying can u shed some light on what could cause this or do u think he would recover