Roach hydra unbeatable? Vipers make siege tanks useless, hydras out dps marines and marauders, mines get easily picked off. Drops get denied. How can this be beaten?

Please, any help is much appriciated. I can't seem to beat it no matter what build I go. It really shits on mech, it shits on pure bio, it shits on marine tank and it shits on bio mine. Don't have anything left to try :| Unless I do something very all innish off of two base, there's literally nothing I can do.-