I'm so sorry that your having such a difficult time. Breaking up causes stress in normal everyday life but during a fast I'm sure its magnified many times over.
I don't know about the Depression your having other than to say that it might be toxins that are being released plus the added stress of the breakup.
I read your story on facebook and I just wanted to tell you how amazing I think you are! You have completely changed your life for the better, I aspire to be like you in that respect. Take pride in your accomplishments, what you are going through right now will pass and you will come out the other side victorious. You have proven just how strong you are.
If you think the stress is too much while fasting. Just be good to yourself and do whatever you feel is necessary for you right now.