You sound perfectly normal, to me.
Your life is exceptionally full and you're frustrated that it often seems as though you're the only one making any extra effort.
Now. The Wisest Mom already gave you good suggestions regarding seeing your doctor to rule out any medical causes of the feelings you're having as well as possibly making an appointment with a therapist.
I will add that at the ages of 3, 4 and 6 your children are not too little to help take care of the household chores.
I will grant that the chores may not be done to your exact specifications, and you will most likely have to expend some time and energy in supervision (at least in the beginning); but there is no time like the present to teach them that they are not the center of the universe and the household does not run without help.
I suggest you make a chore jar for each child.
Write (or use simple pictures) one chore on each slip of paper and put all the slips in the jar. Each day, each child is expected to pull at least one chore slip out of his or her jar and complete the task thereon.
Chores can range from "Put your dirty clothes in the hamper" to "Pick up your toys" or "Fold all the clean towels and put them away on the bathroom shelf."
You decide.
If you wish, you can make completion of the chores contingent upon receipt of an allowance or other reward (adding the carrot to the proverbial stick).
Good luck - and try to remember that you are not alone; it just seems that way right now. Keep asking for help any time you need it - someone's always here to listen!
