I don't knownabout you, OP, but every Christmas, my mother would get up early to put tye turkey in the oven. She would make the stuffing and gravy from scratch, prep and cook the veg, set the table. Etc.
She would refuse all offers of help saying she preferred to do it herself and then spend the evening in tears because she had had to do everything alone and felt underappreciated and taken advantage of. Every year.
I'm not suggesting you've refused offers of help but, equally, if you give yourself a shitload of unnecessary work to do without asking for help then you're kind of creating the situation for yourself.
Easter eggs, Easter egg hunt, cooking Easter cake, making desserts at the last minute to go to lunch elsewhere (and going out in the rain to find ingredients in several shops), organising a special outing.
How much of this was actually necessary? Eggs? A hunt? Maybe if the childen are young but a cake? Multiple desserts? Shopping in the rain in several shops? Organising an outing?
Most of this was completely unnecessary, wasn't it? Did someone ask you to or did you offer? Why couldn't you just say, "No. I've got enough to do already?" Or, "If you want X, Y, Z, you can do that"? You can just say no.