I'll be in your shoes soon, I'm afraid. One thing I've had recommended to me more than once is that (if possible, before baby arrives) get kid #1 hooked into some sort of regular social scene (daycare or preschool) that is all his own so that when baby invades what used to be his normal every day life, he will still have a place that is not baby-invaded. I suppose that, depending on how complicated his little psyche is at this point, that a move in that direction now, after little bro is already here, may just be more disruptive.
I've also had people tell me that it is important for kid #1 to have "responsibilities" for the new baby-- things that he/she does regularly and is praised for, like putting away diapers, washing baby's face with a washcloth, "reading" a bedtime story to baby every night. If kid #1 feels less like a baby who isn't in the limelight and more like someone who is important enough to help with the new change, it may help. It apparently really helped my good friend with her DD.
Not too much help, I'm afraid-- you can tell this is what I've been asking everyone with two kids about! We weren't anticiapting #2 quite so quickly, so I'm trying to get as much info as I can to make it through what I'm sure will be a hard couple of months.
Good luck to you, mama. It would break my heart to have my DS push me away. I hope it passes soon.
Distraction is not the same thing as play.
Be part of the diaper free revolution.
DS1, 8 years. DS2, 6 years. DS3, 2 years. DD1, due April 2015