You should try getting it waxed, it may sound painful but it's definately worth it and if you have a trained therapist do it then the pain should be minimal. Otherwise all I can suggest is using some baby oil gel afterwards - that's worked fo me before when I shaved my bikini line.
As a general rule though I think other hair removal forms are better for that area!

When I first started shaving - it was super itchy. Now its not as bad - approx the third day is when I get a little itchy.
The prob with waxing, besides the pain, is you get crazy ingrown hairs. I was gonna switch to professional waxing but my buddy says that is shaving is what you're used to and it works, then you should stick with it. She used to shave - she waxes now. No harm in trying tho. See what works best for you. Hopefully you have a high tolerance for pain!! Hehe
speaking of pain - a secret I use after shaving that prevents ingrown hairs is to use a cotton ball with rubbing alcohol on it and dabbing on area you shave. I usually only cover the front and a bit on the side - you dont wanna get close to your crotch and have that caca burn your insedes!!!! This is pretty painful - depending on how smooth the shave goes, but I have a pretty high tolerance so its not too bad. Put baby powder on after and you are good to go