I also have 5 babies and it sound to me like you have symphysis pubis dysfunction. There isn't much that can be done for it (and I still get it to this day if I exercise hard and for long amounts of time and my 5th baby just turned 3 in Sept) but there are exercises you can do and a pelvic support belt/brace can help!!!
Here is a good article about it!!!
http://www.whattoexpect.com/pregnanc...function.aspx#
Hope you get some relief soon!!!
