A.,
You need some support. Someone to talk to, someone to help you sort out your feelings and your emotions and reactions... before you hurt one of your children. Screaming and yelling can damage a child's well being just as much as hitting.
Perhaps you need to sit down with your husband at a time when the kids are in bed and it's quiet. Just explain how you are feeling- don't use the "you never, or you don't"- Use "I need some time to myself, or I need some help" Whether it be on Saturday he watches the children for 3 hours so you can take a nap or go for a walk to sit at the park.
Be careful though not to fall into "well he gets a break because he goes to work"- at my work, I am way more stresses some days then when at home. Because then he is feeling "she is home all day, what is wrong"... marriage wise it's just not good to compare the two... because whether you work all day or are a stay at home mom- it's work.
if you find yourself getting to a boiling over point... STOP, THINK, do not react. Stop- take 3 deep breaths, Think about what you are about to do or say (will this tear my child down, will this hurt my child -emotionally) and also think about how can I turn this into a positive?
Example- If your child spills milk for the 3rd time- and you are fixing to yell about being careful- Stop- breathe, think- why is he spilling the milk all the time (perhaps he needs to have a cup with a lid- or only get his drink when sitting on the floor, or at the table)... Positive reaction- spills happen- get a towel and say Oh no- help mommy clean this up. Clean up the mess give hugs.
I learned when my children were young and I was going through a time like this- It was me who needed to stop and makes some changes in how I looked at things and how I reacted. When I became more peaceful and less reactive- my children behaved better and I found joy in being with them.
As for getting ready to go somewhere... have a couple outfits ready at the beginning of the week for times you might go out- When it's time to start getting ready- say to your husband "I will get Ethan dressed,and then I am going to go brush my hair, here is Caden's clothes can you help him and make sure he combs his hair". One thing about men, is you just have to tell them what you need- not assume they know they should help.
Perhaps talking to a pastor at a church can help you. Don't assume your neighbors hate you... go talk to them, see if some have younger kids... go to the park together. HOpe this helps some.