I know just what you are feeling I have always wanted more than 1 child and I am hoping for 3, with my first preg the MS lasted 17.5 weeks and much the same as you. It got to the point where I did not want to leave the house, it was all day and all night.
I was dreading it this time around, it has been bad but not as bad as the first time but still horrible enough. The good thing was though that it only lasted 7 weeks this time, a long 7 weeks but better than 17.5 weeks.
I know this probably didnt make you feel better but just thought I would share.