Chronic Fatigue Syndrome Support Group
Chronic Fatigue Syndrome (ME/CFS) describes a sense of exhaustion and post-exertion malaise, even when you have gotten enough rest and sleep. The disease is characterized by six months of incapacitating fatigue experienced as profound exhaustion and extremely poor stamina, and problems with concentration and short-term memory. The cause is unknown, but it is a...
I don't think ripping your pen from your hand is okay at all...it's very invasive and inappropriately physical. I hope you can get some support with this where you work.
If you can muster enough courage, I think it would help to just tell him off. Say something like..."You are seriously disrespecting me and it's not acceptable. If I need to improve my job performance, please point that out in a respectful manner and stop behaving this way."
I've seen this played out in workplace situations, and standing up to the bully did work. Sometimes people bully without really being fully conscious of what they're doing.
You deserve to be respected.