If extensive GI workup showed no structual problems or ca of esophagus (only esophageal dysmotility) is chonic sore throat & chest 2 yrs later gi?

Maybe. Your sore throat could certainly be a GI cause. I would recommend that you undergo evaluation for acid reflux to see if that is a cause for your sore throat. Esophageal dysmotility could contribute as well, although it depends on what kind of dysmotility you have (there are many).