How do I convince my to go to the doctor if I think she's bipolar?

My mom changes moods every minute. She'll walk in the room screaming calling me a ***** and a slut and a tramp ( i am a relatively conservative teenager I am not a slut or tramp or anything) she tells me to go move to my dads house and she hates me then she'll come back in about 2 minutes and start talking about how she owes me money or how we should go to the movies or something in the calmest voice ever. She needs a job to the point where we've had our house foreclosed on we moved to a house we were renting got kicked out cuz she started screaming at the owner how she payed when she definitely didnt and moved again to another house were renting all of this since december 08. But she's been offered 3 high paying jobs in physical therapy and maging and personal training which is what she's always done and what she wants to do, and shes turned them all down and now shes saying she might have to get a job at mcdonalds because she "cant get a job". She's beaten my dogs and she is completely against animal abuse. She thinks everyone's against her. She gets mad about how my dad never calls me to do anything (theyre divorced) but when he does she gets pissed and doesnt want me to go... Her hand writing also drasticly changes all the time. I've looked up all the symptoms of bipolar disorder and she fits all of them. Its getting to the point where she is really scaring me and I am afraid to be around her. My boyfriend and my friends are afraid to leave me alone at my house. Especially because she is an ex body builder and is extremely strong and could probably knock me out in about 10 seconds if she really wanted to. What can I do? How can I get her to the doctor or something? Or is there something I can give her to make her calm down or anything? I really do not feel safe being around her anymore.