Due to work related stress I have been out sick for six weeks and on medical advice have been advised to leave position as the situation has affected my mental health and going back will exasperate the situation. It is because of my manager and I have spoken to various people and know that to take it down the formal route will not bode well for me and affect my health even more so I just want to leave now and try to get myself back to where I was before I started last August as it has been a nightmare. My question is can I hand in my notice while off sick and can I provide sick certs to cover my notice period as I have tried to go back to do this but the thought of having to face him again just knocked my health completely back. I really hope someone can help me with this question. Thank you.