I'm also on fiber; although I stopped taking it as it seemed to stop working - I'll start taking it again.

It's strange you should mention mental problems. I have been experiencing more headaches of late, my tinnitus has gotten so bad it prevents me from sleeping and my brain seems to hurt when I move my head around too much. I can't decide if this is a migrane or not. But let's put it this way: i'm currently going through the exam seasion at university and my headaches have gotten so bad I'm unable to revise; I'm going to miss my exam tomorrow and try and get my doctor to give me a note detailing why I couldn't take the exam (I'm obviously not going to mention mercury).

In brief: I'm also going to stop taking probiotics. Do you think garlic has the same affect?