Well you definitely NEED to taper. I posted a thread here yesterday about coming off of a 25g a day habit.
I took 25g Saturday, around 15g Sunday, and 6g Monday. Then nothing until yesterday, ended up taking 4g and then 2g a few hours later without relief.
I just got a 100g can of it today thankfully. And just took 10g.
As far as supplements I have no idea but I thought this wouldn't be nearly as bad as a heroin, Xanax or alcohol withdrawal. It's the second worst that I've experienced. First being the equivalent of taking around 90-120mg of Xanax twice a day but the half life was 72 hours vs the 8 with Xanax. That was with this devil called flubromazolam.
Anyway. You can do it man and I'm in the same boat as you! I'll look into it and please post back here if you find something that you think can help!
Somewhere I saw this tapering schedule that went something like this..
You take your usual dose ( the guide stated if your above 2g then get down to 2g, you could just start at your 3.3g and go down from there) you start at 3300mg and take that once daily and the same the next day, the following you take 100mg less for 2 more days and so on till your down to like 100mg. You could either drop that by 10mg or 25mg increments. They say it worrks great and you can still sleep. I don't remember if I saw this on reddit or on here but if someone knows I'll edit and give credit where it's due.
Should be much faster for you than it will be for me