LOL to coming to help 2 kids under 3.5!!! I have 2 kids: ages 2 & 3, so I can totally relate! LOL
Anyhoo.......
My thoughts on the matter of feeling impatient... and I know having a new baby is a happy occassion... but just think about the sleepy nights, round-the-clock nursing, sore nipples, 10 diapers/day, packing up 2 kids vs. 1, loading up 2 kids in the carseats, going grocery shopping with a toddler & a newborn, trying to return to pre-preg weight, etc, etc. Wears me out just thinking about it!!! Don't get me wrong, I'll enjoy caring for and nursing my new baby just as I have #1 and #2, but just try to enjoy your time with "one" child because you will definitely busy busy busy with two children! I am savoring these nights I spend after my children are in bed, sleeping through the entire night, because I know my nights will be unpredictable once there is a newborn in the house again.
Maybe something you can do to help pass the time and the impatient feelings is to catch up on things you may be behind on. If you're like me and most I know, you might be behind on scrapbooks/photo albums. Maybe that's something you can do in a non-queasy manner (LOL). If you enjoy reading, maybe you can find a non-baby book to read to help get your mind off of things. I know it drives me NUTS when I can't stop thinking about something!!!! Dr. Phil's 'Family First' book should be a good read. Or go for something a little daring, like 'Gulag Archipelago' about the mass Russian imprisionments (surprisingly interesting me! and I don't like history nor do I like to read much!).
Then once the queasiness subsides, reorganize a closet, the pantry, etc. Just some thoughts.
You'll get through this

, and before you know it, your new little one will be here!