It's time for the "WE" talk..........the we talk is that WE have a son, a house, jobs, etc..........and only ONE of us seems to be doing most of the WE things........So, either your husband is ignoring your request for help on purpose, or he really doesn't get it.........
You need to sit him down and talk to him..........tell him you understand that he works long hours at a job he enjoys and is working hard..........BUT, you are working too and you are still doing (name all that you do when you get home) and there are days that you are tired, sick, or just would like to get a beer, eat dinner and "de-stress" too......This is a partnership, not a sole run company, and if he doesn't start doing his share, you might just have to fire him!!!!!!!!!!
With that being said, there are ways to help yourself.......first off, don't worry about the house chores as much......do them in spurts, or space them out over the week, try to do a little every day instead of everything every day. And if the house is messy, then hubby can help clean it or not........if people come over, and the house is a mess, well, they should be there to see you, not your house..........on weekends, you can spruce up things as time allows.......
You need to make your husband understand that HE has responsibility in the raising of your son as well, so that includes having a nice home, helping him (son) with homework and showing him how a husband should help and treat his wife.......if not, your son is going to think this kind of behavior is OK and this is the way you treat your wife, you come home, grab a beer, get your supper and that's all you do!!!
Good Luck and take care..........Let us know what happens.