Why is the morphine so variable?

I wish I knew why sometimes my body absorbs the morphine, allowing it to help the pain, and other times it just doesn't.

Like today - I had to take two pills in the space of 2.5 hours this morning, but they worked, and the pain eventually did ease.

It kicked off again around 7pm, and I took three pills over and hour and a half and still nothing. Not only no pain relief, but not even any side effects - no floaty feeling or anything.

But I don't know why. What was different this evening to this morning? I really need to figure this out, because if I can make the pills more effective, I'll be able to take fewer of them.

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