#1, My number one "cause" for making me feel overwhelmed is lack of sleep. My suggestion is, don't waste sleep time on unnecessary things like watching a movie or surfing the net. Not sure if you do this but it makes me crazy when I only sleep for 3 to 4 hours and then I feel like I can't handle anything so try to get 6-7 hours of sleep a night.
#2, try a multivitamin, a B-complex that isn't too strong because the ones that have 1000 x the daily requirement could make you sick, give you a stomach ache, heart palpitations. Just try a B-complex that have close to 100% of the daily requirement
#3, try not to burn out. I know that if I do laundry, groceries and clean the house in one day, by the end of the day, I'm hating everyone! Try spacing things out and like someone else suggested, if you are doing laundry or cleaning, order a pizza and relax when you are done.
#4, Oh and my favorite is, I HATE cooking, so I always cook enough for 2 days. That way, I only have to cook a few times a week, if I order in once a week, I try to order in from some place that sells a Whole chicken that way, we have enough for 2 days and it's healthy.