Negative emotions vs. suffering

How do you distinguish between human suffering and negative emotions? Is suffering simply the rejection of What Is? And then a negative emotion is simply a What Is?

And so they CAN go together, in that it is possible to layer suffering on top of negative emotion by rejecting that negative emotion? But they don’t have to go together, in that we can allow a “negative” emotion, which removes the suffering part and leaves us with peace and presence for our present experience, even when it includes the discomfort of “negative” emotion?