Hi Lynne,
I am so sorry for your loss. Given everything that you're going through with grieving and your health, focus on taking care of yourself. As Terry said, snack on healthy foods, get plenty of rest, drink plenty of water. Journaling helped me quite a bit (I just lost my husband of 29 years in February). Sometimes I would write five or six times a day. And this message board is full of supportive people that are experiencing a lot of the same emotions as you.
I started walking at least 30 minutes a day, almost every day, since Tom passed away. I helps to just clear the head. My house was also pretty quiet so I put a few windchimes on my back porch ... and I always have music playing - instrumental music for now because the lyrics to some songs just set me off.
The other thing I started doing right from the onset was set a goal a day - whether it's running an errand, doing the laundry, making a phone call. Sometimes just getting out of bed was an accomplishment ... but it was something and it forced me to put one foot in front of the other and attempt to function.
Be gentle with yourself, Lynne. The emotions you're feeling are overpowering so don't try to hold it all in. Let it flow.
Take care and post here as often as you feel you need to. I am always conscious of ranting and venting to my support network ... I don't want to become a burden or be judged that I'm not handling things to their standards. The nice thing about this board is that you can vent and rant and just pour out the emotions ... no one will judge you or hurry you along. If anything, we have felt those similar emotions and we understand.