For the last two days, whenever i sleep on my Left side, i wake up with severe pain in my gums right behind my last left molar nd around it. The appearance is swollen and this morning, the top part of the "gum" area behind my molar looked bruised. After i woke up, i tried to move my mouth in efery direction thinking maybe i did something in my sleep to two nights in a row but i couldnt reproduce the pain. That area is still sore. After i would wake up in pain and go to sleep on the other side, the pain on the left would slowly ease down. What do you think is going on?