Yes, it seems to me to we tell ourselves: "I refuse to be happy unless x condition is fulfilled." To me, unconditional happiness is being happy whether your expectations are met or not.
Then how many people do we know who is "unconditional" in their happiness?
Certainly not me.
So, if we can have unconditional happiness, can we also have unconditional grief and sadness?
And if so, how would we tell them a part?
And if we can tell them a part, there must be some distinction/conditions that define them as different states?
Perhaps I just unconditionally accept (and appreciate) that I have conditions.