The 38-year-old added that his father had difficulty concentrating and was “very uncomfortable”. He continued, “There were issues with how he felt and also from a neurological point of view, he wasn’t feeling well.”

The actor’s son also revealed that the drugs Robin took were “really tough on the mind and body”. He said what he felt about his father was “beyond empathy” and the son was “frustrated”.

Zak said, “It can be very isolating even when you are with family and loved ones.” Only two years passed between Robin’s misdiagnosis and his death. Zak said of the time, “It felt a lot longer than it actually was because it was a time of intense search and frustration for him.”

Following his father’s death, Zak said he was diagnosed with post-traumatic stress disorder and turned to alcohol to deal with it. However, he later received help through a 12-step program to recover from addictions and group therapy, he said. Zak is now CEO of Prepare Your Mind, a wellness and anxiety relief product that he worked on after his father passed away. He is also a mental health attorney.