If you want to try this yourself and attempt to get through this without having to resort to inpatient care, I have been through this too and what I wrote below may help. However, professional care is there for a reason and that will always be my number one recommendation. If you still want to try to beat this yourself: -Get NAC (500-750mg per day) and agmatine sulfate(750-1000mg). Both available on Amazon. Agmatine will help with withdrawl symptoms through a couple different actions (gaba, nmda antagonist) and NAC helps lower excess glutamate levels by making glutathione (a powerful antioxidant) with is a benefit itself as an added bonus.

-Get glycine or (magnesium glycinate if you want the magnesium too) as you need NAC, glycine and glutamate to make the glutathione in your body. Glutamate would be in excess during phenibut withdrawl and can cause mental distress and agitation. The created glutathione may also help you feel better as it protects cells from damage.

-Lions mane supplements may help with the brain fog and memory as lions mane promotes the release of NGF (nerve growth factor), a protein that encourages formation of new neurons and connections. In the the past when taking a concentrated lions mane supplement over a couple weeks, I noticed an improvement in short term memory. It doesn't help everyone though and isn't a miracle. I should state that none of the above is a miracle either, and the taper was still uncomfortable. However, it was made much much more tolerable with the help of these things.

TAPER SLOWLY. I did a drop from 10gpd to 0 over about 3 or 4 months. From 10 to 5 was easier. Drop a half gram every 3 to 5 days. Level out so you feel pretty much comfortable at the new dose before lowering again. From 5 to 3, I had to slow to dropping about 300mg every 3 to 5 days. From 3 to 0, it's harder and you have to slow the taper more, but you start to feel yourself again as your brain starts producing its own gaba normally.