Feeling like I can't do anymore but also feel like an asshole

My husband wants to go to the coast for the long weekend to visit his parents and I really don't want to but don't feel like I can say this because it his parents. I just don't have the capacity to cope right now. My 2yo is going theough a sleep regression and wakes up for hours over night and if.my husband tries to settle her she screams for mummy anyways. She self soothes by pulling my hair and needing to be held and touchong me all the time. My work is being really difficult and giving me attitude because I made auggestions to improve things. My sister has moved in was us for the forseeable future and so I am trying to slowly navigate a plan with her to get her back on her feet. My daughters childcare is distressed as she is being so clingy and emotionally needy to them and asking me what to do. I don't know how to explain that if I go to the coast on the weekend and his parents make their usual comments about being woken up by our child I will actually break. I just can't deal with the packing and having to go grocery shopping before we go as they never supply any of the food my daughter can eat. But I also feel like I am an asshole for feeling this. I just want to check into a room for the weekend and have no one touch me or ask me to do something.