Does gabapentin actually help with opioid/benzo withdrawal?

It helped me tremendously. Especially with sleep and restlessness at night. It also helped with the depression I experienced.

"Gabapentin in Addiction Treatment
In the last few years, several studies have demonstrated that gabapentin can be a helpful resource for treating substance abuse in various ways. Specifically, it is useful in treating withdrawal and maintaining abstinence in people struggling with alcohol, benzodiazepine, and opioid addiction.

A research review from Pharmacology & Pharmacy indicates that multiple studies show gabapentin as a positive support to alcohol detox and withdrawal. The drug may help to moderate the discomfort of alcohol withdrawal, and it may also help to manage co-occurring disorders, such as anxiety and depression, during treatment. Because these co-occurring disorders can hinder the addiction treatment process, being able to manage them is likely to provide more positive outcomes from addiction treatment, from detox through recovery.

Gabapentin is also used to help with opioid detox, as detailed in the Journal of Clinical Psychopharmacology, as well as benzodiazepine withdrawal in methadone treatment, described by the American Journal of Drug and Alcohol Abuse. All of these studies indicate major improvements in detox and withdrawal using gabapentin in combination with other treatments, as opposed to using the other treatments alone, as well as in comparison to placebo."

Source: American Addiction Centers