Hi, my heart goes out to you, first off. I think you did the right thing to celebrate on a cruise. I think this vacation will be whatever you would like it to be. You can be a part of things onboard or just relax and do what you want.
I just went on a Carnival cruise alone, having ended an 18 year relationship. This was my 2nd cruise, and it was a good time. But, it for sure would have been better being around lesbian women. I think you are doing the right thing, and at the very least it will serve as a diversion from every day life, right?
Yes, the holidays are tough no matter what we do. Stand up tall, shoulders against the wind, and do the best you can. No one formula works for us all, so time will pass and slowly you will find your way.
Good luck on your cruise, and I hope that you have a good New Year!