Hi Oded
Your post probably wasn't showing because you're a newish member and would have been on moderation, which needs a moderator to release the post, but with it being the festive holidays, it's likely the moderators have been a little busy with real life.
As far as I know the lifeflow sample is a sample of Lifeflow 10 which is one of the Alpha levels.
Brainwave States
Different people will experience different things when they meditate and/or use the entrainment tracks. It is normal that sometimes these things might seem disturbing, but continuing your practice you will find these things disappear, and other things will arise. Take a read of this wonderful thread by Ta-Tsu-Wa... (it's long, but worth a read)
Principles of Meditation & Entrainment
There's no known danger in meditating or entrainment, though there are certainly some people out there who would like to put fear into people and say that there is, but that's usually for their own purposes.
Hugs
Giles