Hi AM - It's so lovely to hear from you but I'm so sorry about what you are going through at the moment. Really don't stress about any weight gain - it will come off when you are ready and in the great scheme of things it's simply not that important (we just make it so).
You know - I think it's great that you are really grieving properly. I know that must sound horrible, but so many people push things like this to the back of their minds and don't deal with it. Something terrible has happened to you and you are well within your rights to be upset and sad about it. Anything else would be unnatural.
Sending you and your OH big hugs - we'll be here when you are ready to jump back on the diet wagon again