Someone posted this to help bring on a period. I've never tried it myself but it might be worth a try:
go to the store and buy a bunch of parsley. Boil some water and add the parsley all chopped up (a LOT of it) and let it steep for about 30 minutes. (not boiling, just steeping). then drain out the parsely and add some peppermint to the parsley tea, and drink it up. Tastes kinda funny.. but it does work to help bring on your missing period. It is an old remedy from back in the good old days
I had a similar problem. I tried a few tricks that poeple had mentioned. I took a hot relaxing bath - make it hot as you can stand. I think that soaking the feet is the most important part of that. I also laid on a heating pad all night. Finally, reaching the big O seems to help. After two days of that, my period finally arrived. Hope it works for you too!