Objective
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Clarify the meanings of these expressions and the functions of 'ir'.

¿Cómo te vas?
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I suppose this is the reflexive form 'irse' and it means "how you leave" or "how you go". 

¿Cómo te va?
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I heard this is equivalent with "Cómo te va la vida a ti", however not sure of the function of 'ir' here. It seems 'ir' has a meaning of 'cause an effect' such as "What has the life done to you", but not sure. Checked [Wordreference](http://www.wordreference.com/es/en/translation.asp?spen=ir) but there seems to be no such meaning explicitly.

Also when I was in hospital in Colombia, a doctor asked "¿Cómo va?" after a while when he gave me an injection. I suppose he asked "How is the treatment working?" or "How did the medicine work?". Is it correct?

Kindly suggest what is the function of 'ir' here.

¿Cómo se va?
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Is it equivalent with '¿Cómo se va la vida a usted?', as well as '¿Cómo se va (para el estación)?' asking how to get to somewhere depending on the contexts? Can I say "¿Dónde se va esta calle?" to ask "Where does this road lead to"?

Kindly suggest what is the function of 'ir' here.