Hyperlacrimation, excess tearing, is a symptom of synkinesis, and I experience it, especially outdoors. I also have what the ophthamologist calls " jaw - wink " which is the connection between moving one facial muscle and another usually unconnected muscle moves, too. When I yawn, my eye closes, when I chew my eye feels like it is squinting. Pursing my lips causes squinting, too. shutting my eye tightly makes my chin move.
There is no medical treatment for synkinesis according to my two doctors, but some retraining exercises help some people. I am hoping it doesn't get worse, I can live with the current extent of my synkinesis just fine, I seem to notice it less as time passes. Good luck