And Popper would say you cannot ever prove another mind or inner state, just as you cannot prove any theory.
But you can propose explanations and try to falsify them. I haven’t thought about it but maybe there is a way to construct an experiment to falsify the claim that you don’t feel emotions.
I suppose there may be a way for me to conduct an experiment on myself, though like you I don't have one readily at hand, but I don't think there's a way for you to conduct such an experiment on me.
I wonder what Popper did say specifically about qualia and such. There's a 1977 book called "The Self and Its Brain: An Argument for Interactionism". Haven't read it.
Preface:
The problem of the relation between our bodies and our minds, and especially of the link between brain structures and processes on the one hand and mental dispositions and events on the other is an exceedingly difficult one. Without pretending to be able to foresee future developments, both authors of this book think it improbable that the problem will ever be solved, in the sense that we shall really understand this relation. We think that no more can be expected than to make a little progress here or there.
But you can propose explanations and try to falsify them. I haven’t thought about it but maybe there is a way to construct an experiment to falsify the claim that you don’t feel emotions.