You two did a great job of defining the "problem" of "the feelings are two" and giving some great answers.
I would only add that Cicero sets up this pain and pleasure spectrum. My analogy would be the timeline we currently use to reckon years. Call the AD/CE side pleasure, the BC/BCE side as pain. There is no year zero. You're either in year 1 BCE or year 1 CE. Same with pleasure and pain, your feeling might be slight, but it's going to be in one era or the other. There is no feeling zero... Unless you've died and ceased to exist.