I know exactly how you feel. Every time I get my period I don't want to move... I want to crawl in a ball and die!!
The things that work best for me are
a) Having a hot bath
b) Taking advils... tylenol's dont do too much. Use IBprofen pills... (advil, alieve, motrin etc)
c) Hot water bottle
d) Actually getting out of bed and moving. I know you really don't want to but excersise does help out a bit.
Also, if they're really that horrible, try to get on birth control. I just started taking it, so i can't really tell you the outcome of it...
hope I helped