When I was at my worst, I had facial numbness. The doc also dx'd trigimenal neuralgia which affected the right side of my face. The numbness would come and go as you have described. During this flare, I would have trouble with my tongue going haywire - sort of like it had a mind of its own (scenes of Exorcist comes to mind, LOL), and I would have trouble with biting my lips/tongue. Sometimes at night my jaw would involuntarily snap shut, which sometimes hit whatever was in the way while I was lost in restless sleep (lips/tongue). I went through a lot of botox therapy combined with cortisone injections. A human pin cushion was I during this era
. But it all helped and I no longer have these issues.