Need some medical advice for my stubborn girlfriend who refuses to go see a doctor!

She refuses to go to the doctors because they always tell her she is fine and not to worry about anything. When she was a child she had bad experiences with doctors as well. For the past two months she has missed her period for starters. Now she is frequently urinating even though she doesn't drink more than usual. It's like she goes before brushing her teeth heads to bed and after a minute in bed she has to go again. It's not just at night she always has to go when she wakes up then she goes downstairs and has to go again. She complains of low stomach pains and back pains. And she feels very dehydrated and when she does she drinks a lot of water but it has no effect. After feeling like that she gets nauseous and needs to sleep or rest. Also she has been very tired larely. Please give me some insight.
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She eats healthy as is because she works as a fitness trainer. So I don't think she can eat any more healthier haha
Need some medical advice for my stubborn girlfriend who refuses to go see a doctor!
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