What about My condition had peaked.
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alc24I'm trying to say it's never been worseThen say: My condition has never been worse.
alc24My condition is at its worstFine.
alc24My condition has peaked.My condition has reached its highest point. I would take it only in a positive sense -- to be at one's best. For example, if you were training for an athletic event, you would want your condition to peak just before the competition began.