This is #4 since BD for me! That seems crazy (as if this whole thing isn't crazy)! First year I was grasping straws and even though he'd moved out, we had Thanksgiving together at his parents' house where he lived. Mistake! Was horribly uncomfortable, and three days later was BD2 when I confirmed their affair. Bad year. By Christmas, he was a clinger, and he came over for awhile on Christmas Eve. WEIRD.
For #2, my dad and I had non-traditional festivities both holidays. Fry bread tacos for Thanksgiving, then I stayed up all night compiling a ream of discovery for my lawyer the next day! LOL MLC traditions. I think I propped the Christmas tree topper up on the fireplace as my decor. No sign of Vanisher.
For #3 last year it was back to more traditional times. Definitely felt like putting a tree up, so I got a smaller one that wasn't as big of a hassle for just one person. Definitely cooked more goodies and watch more movies during the whole season, and in general felt more normal.
This year I hardly even think about what I would do if Hoss was here. Several of our pets have passed away during this time, and a couple are older with their own special needs, so already the "family" feels altered from our old traditions enough that it wouldn't be the same as it was anyway. One thing I've brought back this year though that I haven't done since maybe 2010 is that I'll be making one of Hoss' favorite dishes for Thanksgiving that it triggered me too much to make these MLC years. My dad requested it, so it's like - why not? It's time to take back from MLC things that I loved doing.
I think that's really the key. I remember after my dad got divorced both times, the traditions had to shift at the holidays. We kept what was fun, and got rid of what wasn't. If you feel like there's too much alone time, make yourself go somewhere, or watch a movie/read a book/take a hot bath - whatever can pamper YOU the most, because this IS weird for awhile until it's not.