I'm not an experienced manager or anyone to give advice thereof, but I have experienced what your co-founder is currently going through. Last Year in January, m

I'm not an experienced manager or anyone to give advice thereof, but I have experienced what your co-founder is currently going through. Last Year in January, my father passed away and the next 8-9 months were miserable for me. Sleeplessness, anxiety and depression were almost feeding to each other and took a toll on me. I could hardly sleep for an hour at night for consecutive weeks and months at a time. I would start getting palpitations followed by dangerously high blood pressure. Touch wood, nothing major happened to me and I'm back to normal life. If you guys can cooperate with him and give him the time, I'm sure he will come back to leading a normal productive life. Like someone suggested, give him an indefinite leave of absence and have him work with therapists and recover fully.