B.M.
What will you gain by going part time? What will you lose?
For example, if part of what your salary covered was a cleaning service.... will you now have to do that yourself? In effect adding to your workload by reducing your workload?
Will you have to go shopping at more than one store to adhere to a strict budget so that you can stay within costs...rather than just buying paper towels at the grocery store and being done with it?
Will you lose insurance?
How will your same boss rework your professional expectations and responsibilities? Who will do the work that you are now doing? How will that affect your relationships with the other people you now work with? ie - if you leave will your work just be redistributed to your co-workers who are probably already maxxed out? Correct, not really your concern, but it might affect the "tone" at the office if your co-workers perceive they are picking up your slack.
It might be easier to find a part time job at a DIFFERENT location - a clean break so to speak, which might enable you to set clearer boundaries???
Or - if you DON'T have a cleaning service and that is what is adding to your chaos.... could you hire one rather than cut back on your workload? Could you order from peapod instead of going shopping? so that you have that time to spend with family or just not being as tired?
Also - if you love your work, will you feel like you are "giving it up" for your kids and hubby? If they don't "appreciate" your sacrifice will you be resentful? Or are you giving it up for YOU, which is the same thing, but a different tone and level of expectation for your families reactions?
How easy will it be for you to go back to full time in a couple years? It's REALLY easy to get "mommy tracked". What would that look like at your company and within your family?
Good luck.