Thanks everybody for the support and info. I noticed that taking mestonin makes my eyes twitch and now, as of today, my lips are twitching. It looks like my muscles are jumping. It's very annoying. This doesn't happen every day when I take it, just some. I don't know why. What do you mean by IV IG? I'm a phlebotomist so I kinda know most of the tests they do and why, but I'm new to this one.