sweetpea, you have had a difficult year. Could you motivate yourself to order special food for yourself and DH to eat on Christmas Day? You may not want the full Christmas dinner, in fact I am pretty sure you don't, but think of something nice and a bit more expensive than usual, that you and your DH, would love, and perhaps remember from happy moments in the past.
So many foods, sweets, cakes etc are available online, not necessarily, from major supermarkets. Or you could order a small hamper.
Little effort on your part, but a little treat and excitement for the two of you on Christmas day.