Great question!

Because physical pain is an immediate bodily experience, it is never illusory, it’s direct, so when it’s gone, it’s gone. Same applies to physical pleasure.

Emotional pain or pleasure, on the other hand, are created by the mind. The mind re-creates emotional pain with thought, and it’s capable of doing it over and over again. All emotions are created by the mind.

So recalling an emotional experience is actually just reliving it, in a subtler form. Which is why it’s possible at all to get rid of psychological trauma. Reliving a physical experience by recalling it is impossible - at most you will somewhat re-create your emotional state at the time of the experience, but not the physical sensations themselves. It is also why you don’t experience physical sensations when you dream, regardless of what happens to you there, which is what techniques for inducing lucid dreaming are based on. Dreams are an emotional experience, they are also not real.

This alone should be enough to start questioning what’s real and what’s not, and to what extent your mind creates your reality.