Afraid to use a pendulum

I've been using the pendulum alphabet chart successfully for a few days, and I've gotten wonderful messages from my guides. I know their names, most at least, and have found different personalities in them and all. Today I did some dowsing in a not very peaceful surrounding, I figured I could try if I could focus in a noise and with a lot of people upstairs. At first it worked fine, then I started getting nasty messages, ridiculing me. Actually at first I thought it was just one of my "jokester" guides, but then I got some swear words etc... And figured this is no longer one of my mates. Nothing more than that happened, I asked where did the interference start and my guides answered where - it figured anyway. I didn't do a proper protection before I started, and as I said there was a lot of people out there, who knows what they brought in. Anyway... the protection thing makes sense. I'll have to discuss this later with my guides and figure out what exactly happened.

After "consultation" I was told that one of the boys upstairs "has his demons" and that I picked up on his tormentors. I knew the guy wasn't quite right in the head so not a big surprise. My guides told me not to worry about it though, that it happens on an occasion.