It's a damned shame! I can relate to you, OP. I am immune to Ambien now, thanks to my extreme intolerance. It's like a kind of irreversible mithridatism. I am prescribed 60 × 2mg clonazepam per month, which is primarily responsible for my GABAA receptor agonist or PAM (positive allosteric modulator) insensitivity. The 120mg of clonazepam only ever lasts me fewer than 10 days. And Ambien? Every time I tell myself I'll only take a few 10mg tablets, I inevitably find myself waking up on the floor beside a completely empty medicine bottle and left to ponder why, how and when I took all the pills through an inscrutable fog of amnesia the day after.
Thankfully, however, my desire to deaden my anxiety and overcome my inhibitions is such that no prescriber could legally provide me with enough downers (with the exception of opioids, which I've never cared for nor enjoyed, anyway) to become addicted. The prescription would simply be too ephemeral and short-lived to allow for an addiction to develop.
I spend the other 20+ days of the month forlorn, divested of my pride and joy and left pitiably pining for next month's ration. Goddamn, it seems like forever, but I'm sure impatience and desperation beats withdrawals and addiction.
And the tolerance? It never seems to reset itself. Every month, nevermind the seemingly interminable ⅔ to ¾ of the month wherein I'm suspended in a state of intemperance-induced forbearance, the present prescription always seems to have a lesser life expectancy and a reduced ability to satiate my appetite for anxiolysis and sedation compared to the prior month's supply.
I'm only an average 5 ft 9 in (1.75 m) tall and a lithe 120 lbs (54.55 kg) in weight, so the above-average significance of my tolerance is not mitigated or tempered by a commensurate above-average stature or bodily dimensions.