I don't feel like it's ever going to get better-Any advice?

My husband has a child from an ex girlfriend who seriously is a Troll of a woman. I am so stressed out all the time because she hares me. I've had to block her off of myspace, facebook, ect because she finds me on there and sends me nasty messages. She writes blogs about me on her myspace. I don't go on hers and read them but she used to brag about them to me until I blocked her. She sends my husband texts talking bad about me. He had texting taken off his phone because of it. He's told her repeatedly to stay off my myspace(before I blocked her-now she can't see it) and to quit texting him. He said if it wasn't about their son, she had no business texting. She constantly gripes at my husband and even finds stuff to grip about. She's constantly griping and haring us. She hangs my stepson over my husbands head like a pawn. She threatens that he'll never be able to see his son again. I am just tired and sick of it all, I've recently begun wishing death upon this woman, and that's not like me at all. She is making my life a living H E L L. I weaker woman would have left my husband but I love him so much but I cannot take this drama. She's tried to break us apart by telling me how stupid I was for being with him, that he doesn't love me he's only with me because he can't be alone, he calls me names behind my back, he's embared of me, ect, ect. She flirts with him at pick ups and drop offs and wears revealing clothing. She gets mad and snaps at him if he ignores her advances. I've never hated anyone in my life until now. I've seriously gotten to where I hate her name, the type of car she drives the part of town she lives in, and the fast food restaurant she manages-I refuse to eat there. I hate feeling bitter all the time. I don't want to come off as jealous of his ex-I'm so not( I would never even dream of being like her), but I seriously wish he'd never met her and I wish she wasn't in our lives. Her nastiness has started to damage my relationship with my stepson. Sometimes I push him away and don't want anything to do with him. I cannot fully love him until I can get over my hatred for his mother, it seems. Sometimes I cannot stand to have him around because he reminds me of her existence. I hate feeling that way, especially over an innocent child. I do love my stepson but I have so many emotions and feelings that I'm constantly a jumbled mess! Any advice on how I can get over it and be happy????????? ***I know this is long! Thanks if you read it all.