To be fair its not all that surprising, not when you first start doing it. Its like a lot of drugs/drink demands a lot of self control, more so in fact than others. When you do a drug that has so many positives its hard to put down.
i started doing it about three years ago and it was a cure all for me i loved it, until at the end it started doing me and it nearly did do me in proper stylee!. When i used i made sure i always had a good amount of Valium to come off it. which i did without any probs every so often. however as i was doing gbl i ran out of vals and couldnt get any more so got stuck in a vicious cycle of using it to sleep which only gave me 3 hrs of kip before i had to top up again to get back to sleep. this went on until i was topping up 2ml every hour!
When i decided to slowly withdrawal i had all sorts of nonsense going on in me head, hallucinating hearing things etc etc. As bad as it got valium was a wonder, straight away felt normal. I got lucky i know of people that didnt.
So i would suggest that if anyone is thinking or has decided to do it always have some valium on hand to get you out of trouble. I would of course suggest not taking it at all but i would no doubt be wasting my time as someone would be if they were advising me!
If anyone finds themselves in trouble with gbl look up http://www.clubdrugclinic.com Chelsea and Westminster hospital. they specialise in gbl withdrawal.
It can be a fantastical drug but it demands soooo much self control. Ive learnt how to deal with it but it nearly dealt with me so be careful people!