How can I convince my Mom to help me out?

Hey yes I just wrote a thing about moving out of the house…here is another part of why I need help.

  Last night I called my mom because I was in very very much pain in my jaw neck and left temple, because I have an infection that I have told my mom about but she will not do anything...anyways I called her last night and she said take advil go to sleep and you'll be fine...well I did what she said and couldnt sleep cuz I was in too much pain...so since i continuously called my mom and she wouldnt answer her phone I called Renae(my boss) and asked her if she knew of anything that could help. She advised me to put cloves on it(which by the way if you have a  tooth that is infected or in pain colves will numb it) so i did and it helped out a little but my jaw neck and everything else still hurt. so Renae called the dentist and had them call me. I talked to them and answered their questions and they said that I needed to go to urgent care and have them take care of it. So my boss(just worrying about my well being) came picked me up and took me to urgent care...on my way there i continued to call her, my mom. Finally after i got into the parking lot she answered her phone and was very rude...she then yelled at me told me to go home and said that the only reason I said I was in pain was to get attention and that we did not have the money for it even if it really is infected...then my boss continued to say that if she would consent to them taking care of me that she would pay for it and I would just work it off or I could pay for it myself it would just take out of my college money...my mom flipped out and made me come home right then. so I went home so i would not get in trouble. When I got there she yelled at me and Renae and told us that we did the wrong thing...Well...then my mom called all her friends and made me look like a fool by telling them this story which was the twisted truth! She still hasnt taken care of it and won't. I talked to the dentist and they said that the infection can get in my blood stream and go straight to my heart and cause CRP...scary thought...when we told my mom that she said she knew that and didnt care...What do I do? I don't want to continue suffering...but I can't consent to getting the infection taken care of without her written agreement...How should I confront my mom about it?

another thing is I blew my knee out a few weeks ago while i was jogging it bacame inflammed to the size of my thigh and I went to the chiropractor and he said that I need to get it drained and needed an MRI…my mom insisted that I was fine and didnt want to take me to the doctor. Well my boss took me to my moms work to drop me off after i got off work(she works at a doctors office) when her boss(Dr. Brillhart) walked out he could not believe my mom would not do anything about it cuz it was appearant that it needed to be taken care of right away….so he and my mom argued the whole time about whether we could wait or not…finally she gave in and let him drain my knee…when he did he said that if i wouldn’t have gotten that done that the main artery in my leg had so much pressure on it that it could have popped…she didnt care and said well she would have gotten over it. She clearly doesnt even care about my well being either that or just doesnt have enough concern that I am healthy . How do I deal with this…it tears me apart!