My throat has felt tight for the past couple of years. Only on the left side. When I get sick and a sore throat occurs only the left side is sore.?

???? Have you seen an ENT or GI for a scope to look into the throat and surrounding tissues? If not, do so. If you have, then you need to get a ct scan of the soft tissues of your neck. Don't hesitate and wait. This could be serious.