I also had red hair when young, red/brown now. Something similar happened to me as well, woke up early from my tonsillectomy surgery when I was in HS and the nurse ran in and was saying I wasn't meant to be awake yet, gave me some morphine quickly. Not fun.
And I've had the same issue with dental work. Whenever possible, e.g, small fillings,I now go without anesthetic. Because if it's going to hurt anyway, why bother with the numbing in the first place. I can handle intense pain for a short duration, and it saves all the time having to wait for it to wear off. The dentist I have now has hesitantly complied, says it unnerves him to know I am feeling everything. I can tell a difference in how he works when I am numbed versus not.
Do you also have issues with some pain relievers not working, or wearing off almost instantly? I can find some relief from ibuprofen, but acetaminophen is useless.