Psychosomatic symptom. Following trauma?

Foreign body dust in throat sticking in back of throat following inhalation of dust particle while cleaning room couldn't viualize it but whenever I try to swallow it pains on the right side. When I breath I feel like coughing all time and it's very unpleasant and discomforting there.. But when I tried to move it with my index finger it did initially to the up it caused severe throat pain it was not a normal pain and then I pushed it so much down and now I can't pull it up back and it pain while swallowing did. And endoscopy it is normal they say did an mri too.. But the dust particle is very small which couldn't be visualized in imaging. I still feel it is struck there down below right side throat I feel very depressed at times as the pain arises while I swallow and that particular area seems very dull and stiff in throat . Is it psycho somatic symptom following trauma?? Or there is really foreign dust particle present there.