Just a quick google search:
Hydrocodone is a semisynthetic opioid medication that is widely used as an analgesic and antitussive. Since 2004 it has been the most commonly prescribed drug in the United States and is often misused as a drug of abuse. Hydrocodone is frequently encountered in the postmortem setting, both as a...
pubmed.ncbi.nlm.nih.gov
Not sure of my math but that would mean post mortem they found a total of about 20mg? Prescriptions are typically extended release formula in the 10-20mg range. We're guessing for those who've intentionally taken too much, they either crushed the pills or took more than 20 at the same time. Looking around online it looks like there's a number of cases where they took acetaminophen with their hydrocodone. Either way, surviving this kind of attempt will seriously damage your liver.
Sorry you're in so much pain. Be well on your journey.