So, I've been having this stabbing chest pain for 2-3 weeks now. It's on the left side, right where the heart is located. The pain is always in the same small area. It's not strong, I can live with it but I'm really scared that what if it's actually a heart attack? But it's been a few weeks already and I don't know if a heart attack can last that long. I also had the flu a few weeks ago, and this started after that. 

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For these past couple of days I've also noticed that my chest muscles have been tight, right where the small pectoral muscles are on both sides. It's not painful though, just feels tight.

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I've had a lot of anxiety about this and other things too which I'm sure are prolonging the pain. I know that if I went to the hospital they wouldn't take me seriously. (I'm only 18 and they have a history of not caring for young patients well.)

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Could this be just anxiety, muscle problems or should I be actually worried? I have a doctor's appointment regarding something else next week and I don't know if I should wait that long.