Help! what to do?

Lexus
Okay, I'm 28 weeks 2 days and really need to switch doctors. My doctor only stays and talks to me maybe 2 minutes, won't tell me why I'm bleeding, or offereing any type of test, and won't tell me the results of my glucose test even though it's been a month! She doesn't listen and will call me a liar if I tell her what's wrong. I know some doctors have cut off dates on when they accept new patients depending on how far along they are. I know a few that will take new patients up until 32 weeks. My question is, how do I go about switching? I'm a first time mom and a teen mom at that and have no clue how to do this. Any help would be appreciated. Thanks in advance!