As Rosey says, everyone has different symptoms so there is no real definition of 'normal'.
I get a pressure feeling at the base of my skull and it has it's own 'beat'. This is normally accompanied by a strange feeling in my neck and a creaky, grindy noise when I move my head around, and often a popping noise as well.
I also have stabbing feelings at several points in my head and the left side of my face feels numb. If I do anything too quickly (get up, go upstairs) I get an amazing head-rush dizzy feeling and lose my balance.
Hope this helps. Good luck with the LP. Remember to stay relaxed and drink loads of fluids after. Let us know how you get on,