Hi Alexandra and welcome to the forum.
Sorry to hear your fiance passed away
Sounds like the grief is affecting your lifestyle. Everyone grieves in their own way and that will hopefully slowly get less with time. It's hard to find motivation to do these things when your emotions are all over the place, try to be a bit forgiving of yourself while that happens, but it looks like you're getting to the stage where you're wanting to re-focus on you, that's good too.
Don't panic too much, it will come back off. It just sounds like for the minute while you're grieving everything else has hit the fan, which means hopefully as things settle you'll pick back up on those habits you had before. Just take it a little step at a time, focus on taking care of yourself (so that includes eating, sleeping and being a bit active - you might find you even feel better with a few self care strategies) and if you think you need professional help to work on your emotions and how you're coping, then by all means get it (not saying you do, just mentioning it in case you feel you do).
35kg lost. (November 2005 - October 2006)
15kg gained again (as at October 2010).
Back to the drawing board - Let's do this thing!
"You can't change the winds, but you can change the sails"
"Reach out and take control of what lands in your lap"