I had a similar problem a while back...I was getting the same noise (throwout bearing) only it went away...then a couple of days later, the clutch was f*%^ed and I was stranded on the side of the road and had to get it towed...the beautiful thing about all of this is, I had just had my clutch replaced about 2000km before, and they didn't replace the throwout bearing like I asked...needless to say, they replaced the clutch with no cost to me...