Gwyn, I am so sorry that you're having to go through this! There are so many variables, and try as we might, no one can tell you how to work through your grief. Randy's passing has left a huge void in your life, you've not only lost your best friend....you took care of Randy for a good many years, and now he doesn't need taking care of anymore. The thing to keep in mind is that you are still needed and much loved, both by your family and your friends.
Nothing any of us says is going to make it easier to regulate your appetite, or to dry your tears...but it really is good advice...a support group will bring you into contact with others that are going through, or have already gone through what you are going through now. Trying to control your eating when you're an emotional eater and going through a plethora of emotions is going to be tough. I'm not sure I'd even try at this point...there's time enough later to get a grip on that.
Do something that makes you feel close to Randy. Something that the two of you enjoyed together....or get a journal and write letters to him.
Keep talking to those that care about you! You're an incredibly special woman, much loved and extremely talented! We'll help you in any way we can....we all love you to pieces, and I know I sure enjoy seeing your work!! I promise it's going to get easier to deal with...it's still too fresh to worry much about "getting on with life"...give yourself time to grieve the loss of Randy, and when you're ready, you'll find a niche that suits you.
~MEGA HUGS~