Mike, I share your frustration, every moment of it.
I've just had the second spinal op of the year (stitches out yesterday). Access to the cervical vertebrae involves coming in from either the front or back of the neck. My issue necessitated the back (which, counter-intuitively, is actually worse for the patient, apparently), which in turn means cutting through muscle, and presumably tendons, between the shoulder blades at the top.
Presently, lifting anything heavier than a half-full kettle of water ist offiziell strengstens verboten.*
I learned the hard way last time, and I think I also did something stupid two days ago, roughly three weeks after the second op.
The problem comes when you begin to feel better, but you're really not. Codeine helps the pain, but it also disguises your vulnerability. And convalescence is staggeringly frustrating.
On the more entertaining painkillers: codeine I like to keep well under the allowed quantity, for two reasons. I hate the thought of addiction, and not dulling the pain completely also gives me a reminder to be cautious. I'm also on Pregabalin (nerve-painkiller), which is also addictive, and entertaining in its own right: "maximum of three per day, as needed." I only ever take two, with one embarrassing exception: early on after op #1, I took the last two of the day, together, at bedtime, assuming that would help me sleep. 4am; need a pee; try to get up; legs just won't cooperate at all - like rubber. Yup, 'twas the Pregabalin shutting off all messages...
... Given your own op, you might need to carefully plan for that little issue arising, also for the effect codeine and other opiate painkillers have on the bowel. I recommend not just a Senna-based laxative, but a stool softener such as Dulcoease - you can always not take stuff, but the converse isn't fun. OK, Waaay too much information, I know...
Anyway, I truly do share your frustration, but at least you know things will improve. In my case there's no guarantee, and statistically it's unlikely. I should still be able to drive (eventually), but the limp may well be fun forever.
As others here, especially one particular now-absent friend, would immediately say, "KBO".
*"officially very forbidden." [c] Google Xlate.