I hear you, and fully understand the feeling of being overwhelmed, and the Mommy guilt. I am in a similar situation (only we own our own business, and I work at Home). I'll tell you what I have ended up doing, and maybe some of the things will work for you and your home. On Sundays my three year old and I spend the afternoon making up the coming weeks meals (chicken pot pie, Lasanga, homemade mac-n-cheese, cooking the meat for taco night, suffed cabbage, etc). The three year old loves spending time with me, and being "my lil Chef". It satifies his need for quality time with his mom, and helps me out greatly with all the weekday meals. Meals can be popped in the oven, salad, or canned vegtable heat, and dinner is done. While dinner is heating I can sit and play with mye three year old and nine month old.
As for the dreaded toy clutter. I ended up purchasing one of those bin shelf things (they have like ten-twelve bins). Once the bins reach full capacity, then items are boxed up and put in the attic. Couple months down the road, toys are swaped out with attic stuff, given to younger brother, or disgarded. Basically I limit how many toys are available in the household in one time. I also have a small basket which toys are stored in the living room. When that basket is full nothing more can come into the living room until something else is put away in their rooms.
As far as your partner helping out, good luck with that! I finally gave up and assumed I was sole care giver to the boys and I didn't want to keep having the same arguement over and over. Once I came to that decision, the resentment I felt started to fade, and their dad actually started helping out a little bit more (once I stopped asking of coarse). Make no mistake I still do ninety percent of the raising, and household chores, but his ten percent helps.
As for Laundry, I haven't figured out a solution for that one. Best of luck, and hang in there. Feel free to vent anytime, we all have been there, and will be there again...LOL