Feeling angry when I should be happy

I should be excited but I am just majorly stressed out right now. It's 6 days until Christmas and 4 days until my sister and nephew are here. Instead of wrapping up gifts or finishing the project for my sister or out looking at lights or even making cookies with the kids all I seem to have been doing is cleaning the house. I'm not having any fun and my house isn't even decorated to it's usual overdone self.

I am looking forward to seeing my sister but I feel like all my happy energy is just gone at this point. I really want to be selfish and just have it be me and her the whole time but I am having to share her with extended family that I don't even want to spend holidays with because they have treated me and my family like crap the last few years and are only being half way nice to me because they want to see Amy after 34 years. I understand that they want to see her but I'm still pissy at them over how they have treated us and the fact that they are kinda taking over Christmas day. It's a struggle not to just scream at them to leave me alone and stop telling me what's going to happen. The only reason I don't is because I know Amy wants to see them.

I'm feeling terribly overworked and under appreciated by JT and the kids. I feel like they use me as their personal cleaning and cooking service most days. despite my health and horrible pain levels I strive to always do things that put them first but it seems none of them do much of anything for me. They all leave food everywhere, can't get laundry into the hamper or trash into the can. None of them seem to know how to put a roll of toilet paper on, operate a broom, dish rag, washer or vacuum. I'm constantly on the kids to do the simple chores that they have every day and every day they give me crap and excuses about not doing them. They never ever do anything extra without a direct order. JT doesn't take care of anybody but himself and even that he doesn't always do without me telling him to. I don't get meals made for me or my dishes put in the sink. Nobody picks up my mess when I just hurt to much to move. My hobbies or even reading a book have to be squeezed in at the end of the day after I've done for everybody else and made sure all the kids are in bed and JT has had time to talk at me. We don't usually watch what I want on tv or listen to the music I'd like or even go to movies that are my first pick. I can't take a shower without being interrupted. I have to be completely responsible for all things medical and educational all the time. I'm also solely responsible for groceries, household things, and 90% of bills and budget. It's overwhelming, frustrating and depressing when nobody reciprocates anything I do in kind.

I've been so happily looking forward to this visit from my sister but now I'm afraid I'll just be angry at everybody else while she is here. This is the first Christmas we will have had together since I was a year and half old and she was 6. My mother hasn't had us in the same room with her in 33 years. When she was seven she was taken by her father. I saw her again when I was 14 for a few short weeks and we didn't talk again until about 4 years ago. It's only been in the last two years that we've become close. Every year, as a child, I asked Santa for my sister for Christmas and I never got her but this year I finally do. I don't want all this anger and frustration to surround this wonderful time. It's just very hard to not have it when I spend hours a day putting myself in pain just to clean up basic things that others could do but just won't!