Im surprised people are saying you can cold turkey. I haven't used too much G even though its my favourite drug(its just very hard to get) but I would definitely thing 20ml a day for 10-14 days would certainly cause withdrawals dangerous enough to warrant a taper. and besides, why risk having a seizure when the OP said tapering with benzo's is possible.
If I were you id cease use, wait until your feeling pretty terrible then depending on what benzo your using maybe start with 20mg of Valium, 2mg Xanax/Clonazepam or equivalent doses of whatever benzo, if that isn't helping then double the dose but I wouldn't be taking more than 40mg of valium of 4mg of Xanax/clonaz coz you will just end up with a benzo habit. Stay on that dose for 2-3 days then start reducing my 2.5mg every 2 days. That might be being overly safe but GABA drugs as everyone knows aren't a joke and better safe than sorry.
Im not jealous of the habit but im so jealous of all these people that get GHB/GBL so easily. I only tried it 4-5 times 7-8 years ago and I would get so incredibly euphoric and my libido would skyrocket! I hear of 2 types of people, people that find G boring and not euphoric and others that find it almost orgasmic(there is a sweet spot for sure though like many drugs have, for me that was 2.5ml of GBL). Its quite big in the Sydney gay community probably because it mixes with crystal meth like bread on butter and both crystal and G are both very sexual drugs and if you know what the gay communities around the world are like(most are quite similar) then you'd know that they will do anything to make sex better. You go to some clubs down there and the floor is littered with those soy sauce bottles shaped like a fish by the end of the night. Funnily enough ketamine is the other main drug in the gay community and im not quite sure why, it's sub-k-hole doses, so maybe its just that K maybe gives your mind a break for an hour or so if you've been clubbing and having a lot of sex. In tiny doses people say it can feel like MDMA(I cant agree there) so I don't know, maybe its used to make the obvious pain of copping a large body organ where the sun don't shine easier. I cant say but I totally understand the G & ice thing.
I guess a lot of people get addicted to it because its an anxiolytic as well and a sleep aid, but for me its only useful for long sex sessions that include crystal meth, maybe a rave and on the tail end of a Psychedelic or MDMA dose. Its one of the few CNS depressants that don't dull the effects of the MDMA/psych, K the only other "downer" type drug that doesn't seem to dull the trip/roll. I remember it being very, very cheap too. The retail prices ive heard people paying are probably triple what I used to pay for it but I guess if you get it cheap it could be easy to binge on. GABA drugs scare me too much to let myself become dependent on though. Ive used benzo's for over 10 years and only ever been dependent once, they get stashed until I absolutely need them or im coming down off a stimulant, im pretty sure it takes a much shorter amount of time to become physically dependent on G than benzos.