Wow, that's quite a leap and wholly unsupported by the rapidly advancing science in biology. You may want to look back and watch the Anil Seth clip about how our brains process incoming sensory information and trigger an illusionary but real experience. As Anil Seth proposes; "you don't need to be smart (intelligent) to feel pain, but you probably have to be alive". All experiences of being Sad, happy, pain, joy, gratification, and a host of other sensory experiences are produced by the brain. Pain is experienced in the subconscious body control functions of the brain. We cannot "see" inside our bodies, but that subconscious "control mechanism" will tell us when something goes wrong with our bodies. In fact it is what keeps us alive. We know that all sensory experiences are caused by electro/chemical information processed by the brain. And I am sure that pain experienced by the brain is a chemical phenomenon. Perhaps an acid which "burns" living tissue and is experienced by the brain as the "emotional experience" of pain. Consider "pain killing" medicine (chemicals) which reduce the experience of pain. How does that happen? They clearly affect brain function (warning, do not use while driving). How does that happen? What about anti-inflammable medicine (chemicals) which control the swelling of injured tissue? These are all chemical processes, some directly introduced into the blood stream, or naturally produced by the brain, stimulating glands which produce chemicals. One important fact to remember is that the brain and body recognize these chemicals. This is why they are effective in the first place. Our study of brain functions is new but rapidly advancing due to our increasing ability to look at nano scales. Who knows what we will find there. To dismiss the study of emotional experiences such as "pain" as "pseudoscience" is wholly unwaranted at this time. Can you offer another alternative? If not, then you do not have standing to make such a claim (from ignorance).