Almost a month ago, I experienced numbness starting in my right thumb and
index finger, and it spread up my forearm, upper arm, around the back of my neck, into my left jaw, left chin, left ear, left cheek, and into my tongue. I also felt numbness in my left mid-back, left shoulder blade, left breast, and the back of my left upper arm. This all happened after I had been seated for more than 5 hours.