Everyone feels like that at some point. Even your aloof hubby.
3 kids under 5 is a pain. Especially if the 4yr (assuming one is 4) old isn't in pre-school. It's good that you're being treated. It almost sounds like what I dealt with during PPD.
One thing I've learned... The house can wait til tomorrow (or whatever day you have a bit of time). When my kids are taking a bath, I'll clean the sink and toilet. Get two things done while watching them. It's all about creative thinking and getting the kids to see it as a fun time to help mommy. When changing a bed, the kids will be there with me sometimes and I'll toss the dirty sheets on them or into a pile and they play in them. Now that my daughter is 7, she puts her clean laundry away. Do I like how she does it? No, but it saves me from having to do that particular task. I guess my point is, you don't have to exhaust yourself to get one thing done a day. Routine is what keeps things easier.
As far as your hubby. A compliment to him can help to make him see what he's not helping with. I know that sounds nuts, but it also helps you to see the good in him too. Something as simple as him rinsing his dish or glass to put it in the dishwasher... That's one less thing you have to do. If he goes to work full time... That means he's not a dead beat and mooching. Us women think that we should get thank yous and praises for what we do every day... What about saying thanks to our guys for what they do too?
One last thing... Working with men since I was 16 and talking with my husband (which is very open with me just as I am with him), I've learned that if you don't say EXACTLY what you want from him, he won't know what you want....... Men don't understand hints. You can read some of my posts to understand more. I KNOW my hubby and I don't think the same. That's why we talk about everything.