I have gerd, but lately after im done eating and drinking water i get this cooling/menthol sensation on the left side of my chest into my left shoulder if i recline in my chair or lie down. when i get up and start moving around it goes away. strange?

It is not surprising that you would get GERD symptoms if you recline or lie down after eating. You should stay upright for a couple of hours after eating to prevent this. The cooling sensation is a bit odd unless you have eaten cooler things that are now refluxing. If this continues, you should see your GI doctor for more treatment of your GERD. Good luck!