what do I do?!

Sooooo at school on Thursday my best friend walked up to me and said I need to stop say crap behind her back! But I haven't ever! Now I'm being call a slut and a b**** and etc and i don't know what to do?! All my friends are leaving me and calling me fake! And like now I have a bunch of people trying to fight me over what my so called best friend said I said and I'm so confused!! I have really bad anxiety and with having a pacemaker it causes it to act up which leads to my heart beating tooooo fast or skipping beats which is highly dangerous for me! I'm freaking out now because I have no one in this state to talk to they all hate me! I mean there is this new girl we were friends durning first and then second period came and she started yelling at me about stuff I never said! I wish I never moved here! My anxiety has got worse since I moved to Texas and lost all my friends and I want to switch school but I can't my parents won't let me! This girl pushed me down in the hall saying I'm a slut and I have bruises on my legs from being kicked by the girls at school! What do I do? I'm freaking out! I just hate this!