This sentence uses were and is fine.
"Should I tell her my feelings?" ~ "I wouldn't if I were you."
But then, in a conference, I'm telling my friend...
"If I was sick, I'd have surely gone by now."
My homework: I went through the selected answer here but, to be frank, I'm not utterly satisfied. Similarly, I read StoneyB's answer but he straightforwardly suggests using were in conditional events.
I think this question will have specific discussion about it and thus I'm posting it for the sake of clarity.