What will happen if you take Fentanyl while on suboxone?

a friend has told me that you get very sick and nauseous if you mix the 2

if you are addicted to heroin and you take suboxone, you will become violently ill. I was told by user friends to wait at least 24 hrs after taking last dose of heroin. I waited and still began vomitting for hours and crapping myself (no joke), went to hospital only to find they give you no sympathy and no help. Do not take suboxone unless it's been 48 hours or more since last hit of dope (heroin).