to you Ali - reading your post was like i had written it myself. I keep telling myself what others here have said that before long they will be interacting/playing with each other and everything will get easier, but it is very hard to deal with especially when the elder child puts the "sulks" on as the little one is having a rubbish day/week
You are doing a great job and are a fantastic mum to your 2 little darlings and you know what - housework will always be there but your kids are only kids once and for such a short time so enjoy spending time with them and don't stress about a perfectly kept home. Also if you are looking forward to going back to work this may be a good thing as you will probably feel better about yourself as you are getting adult interaction and also not feel so guilty about not have done "everything" around the house.