Lets say if you tried to kill yourself by taking a massive injection, what happens and how does it feel?
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It would be rapid, and you would likely "drift off" into unconsciousness before feeling any initial euphoria. Once unconscious, respiration and pulse would slow and eventually stop. Without immediate medical attention, death would occur.
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You will breathe with a breathing frequency of 2 -4 per minute (normal: 12 - 15) and you will get hypoxic and hypercapnic (CO2 will accumulate in the blood) without noticing it. You will feel quite comfortable until you are dead. "Morphine" is coming from "amorph" and is contained in "morphing": everything feels the same way, no pain no fear, just an amorphic "mass".