Quoting April Kobelnyk:" How do you balance the morning sickness and general crappy days when you have a 2 year old? Any tips to make it a bit easier?"
My twins were 25 months old when my son was born. With him, I was blood transfusion dependent. I was pretty sick. I would get up with the girls, make their breakfast and then bring them into my bed with a few of their favorite toys and turn their cartoons on. I would have some of their favorites DVR'd. As soon as their show would get over I would hear "Uh Oh mommy!", then I knew my 30 min nap was over. lol I would sneak as many naps as I could while keeping them on a schedule and giving them as much attention as possible. At the time my husband worked close to the house so he was able to come home at night and help more.
What saved us was me getting them super involved in the pregnancy. They were so excited for their baby brother that when I said it was time for nap for mommy and baby, they would lay with me for a short nap, they wanted to help pick things out for him, ect. The second he was born he was THEIR baby. They are 4 and 2 now and are still best buddies.
If you can, take a day when you have extra help with her and enlist a friend or family member to help you do some make ahead meals. get some in the freezer for the days when you really don't feel like moving. Fortunately, most people get over the icky part in a few weeks. Few carry it all the way thru. I have a blood disorder. That is why I was getting transfusions every 7-12 days and was always so tired. Fortunately, being a SAHM and having some (not much) help got me thru the rough parts.