A heart that hurts

How does it feel? How do you know that what you feel is just a product from your imagination? How do you know if that kind of imagination is not from your head? How do you know that what you feel then is not a product from your head? How do you know you will can feel the same? How do you know if it feels bad? How do you know that what i feel is the same as what you feel? How do you know if from feelings an idea can born? How do you know if from an idea a feeling can born? How do you know if you feel that feeling? ... then How do you know how does it feel?  

There is just a simple answer ... It feels really BAD ... and i had never felt this.