Good on you Linda. You are probably right - if you did come off cambridge now, even though it would be totally understandable, you would just feel worse.
Tuesday was the first anniversary of my Dad's death and I felt really low. I really really wanted to comfort eat. But I knew that my Dad would have been annoyed and said to me "you got to keep going - you are doing so well, don't slip up because of me"
From what you have said I know that your friend would be saying the same to you.