So according to various reports Sushant suffered from clinical depression, schizophrenia, bipolar disorder, hyperanxiety, existential crisis, DID (this one was referred to in one of the whatsapp chats between Shruti Modi and Rhea, and I looked it up, it's Dissociative identity disorder).
Can the doctors make up their mind what exactly he was supposed to be suffering from?
that depends on what drugs from chat will be reveal next, suddenly Sushant also was having memory problem, he started forgetting, thus did not called anybody.