Mom won't take me to a doctor?

So basically I've been unwell for a few months. I'm (very) tired 24/7 even though I get a good amount of sleep. My immune system hasn't been so great, I'm constantly getting ill. It's affecting my school work greatly. I asked mom if I could go to a doctor to see if I can get tested but she keeps disregarding what I ask. She keeps saying "Oh, you probably have anaemia, I know what to do". I would rather be diagnosed by a doctor than my mother. What can I do?
Mom won't take me to a doctor?
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