Agree with talking to neuro about it.

I got a "high" after taking the shot for the first 3 months. Made me a little giddy (had to switch shots from night to morning because of this), so I guess it's possible there's a chance for the opposite end of the spectrum.

My Neuro wasn't sure if this was caused by the C or by the flare I was in when I started, but it did go away. Hope things get better for ya!