You have my deepest sympathies! I've got four children and was sick with three of them. My last pregnancy was the absolute worst (sick for almost six months). There wasn't anything that provided complete relief, but I tried anything that would offer even temporary relief. Here are some suggestions;
1) Coca Cola slurpees; I'm not usually a Coke drinker, but there was something soothing about Coke (not Pepsi, or off-brand cola). I craved it during morning sickness with all of my pregnancies. Something about the ice in the slurpee seemed to calm the nausea. Ice cold watermelon was good, too.
2) Crystallized ginger; just eat is straight like it was candy. It helped relieve the nausea some
3) Try to keep food in your stomach all the time. The nausea seems to be much worse on an empty stomach. If you're sick of Saltines, try Triscuits.
4) Send money to school so your son can buy a cafeteria lunch!
5) Order take out, or BBQ outside to minimize food smells in the house. Keep the garbage cans empty and open the windows.
6) Don't brush your teeth with toothpaste. If you can't even stand the toothbrush, just floss and rinse with mouthwash.
7) Ice cold water in the stomach can sometimes help, too.
Good luck!