Without meaning to sound patronising, Scarlett, you do sound a bit down, and it is often harder to tolerate the racket of other people enjoying themselves when you are feeling down yourself (I know, I have been that person). Is there anyone who could sit with you for a while over Christmas? Or even talk to someone on the phone? I am going to stick my neck out here, and suggest (as you have asked for help on here) that you might also ask for help from the Samaritans, who have a free phone number and who will be available all over the Christmas period.
https://samaritans.org Just talking to someone for a while when you are alone might make the noise from upstairs easier to bear. Please let us know how you are - I will be checking back to see if you have posted. Hugs.