I had all day "morning sickness" with my current pregnancy and I also have a two year old, so I feel for you. It got so bad that my little boy started telling people that "Mommy is broke" because I could barely get off the couch most days. I got drinks and snacks to settle my stomach, snacks and drinks for him, the remote, books, coloring books, crayons, small blocks and the phone and put them all on the tables near me. Sure it's not the ideal, stimulating situation but when you're sick you can only do the best you can. DH made a special effort to play with him and get him out when he came home, that helped a lot and gave him something to look forward to. My sickness lasted from week 5 to week 14 and even though I definitely wasn't an engaging, on top of everything mama during that time, my little guy seems no worse for it. I hope you get to feeling better soon!