Irritability, loss of interest, loss of focus/attention, negative thinking, emotions & behaviour (which is what personality is) and comfort eating (which is what I presume you are doing by over eating....are you eating a lot only when you are stressed/anticipating stress?-if yes, that is comfort eating) all point to depression
which needs to be diagnosed only after a full history taking and detailed examination of your problems.
But, if you are not getting enough sleep because of working night shifts and doing household work during the days, then it could be simply because of this....it could be the way your body reminding you that it is chronically not getting enough recharge. If this is the case a simple shift in your priorities during day time or a shift in the working times if this is possible, can help you.
Please do consult a psychiatrist