Answers:
You cannot stop an involuntary response, but if you are flinching too much, it may be going to something have happen to you surrounded by times past?
only woosies flinch, boo!! , two for flinching.
no, seriously, unless you are expecting it you can control it, resembling waiting for a hit or something, but you can't stop from flinching.
One thing I enjoy notice is when I am more tired, my body does not take action to stimuli contained by impossible to tell apart amount as it does when I am smaller quantity tired. This could be one perfect article something like mortal tired.
A while ago when I be flinching a large amount, I would articulate this phrase that seem to back. It be, "Expect The Unexpected". My body seem to counter positively to that phrase.
Good Luck