That's interesting, what substance are you taking 10mg of? If it's a long-acting/ delayed release opioid then I am pretty pretty sure that your suicidal thoughts in the morning are pushed by waking up with slight WDs (they don't have to be physical, in my experience the emotional effects of WD are there before the physical ones and stronger too).
I must say I never took any drug "for fun" or "recreational" use. I suffer from extreme pain, extreme depression and also trauma. It's a mixture of all of this, the pain manifests in my stomach after what happened to me, you can call it psychosomatic but believe me it's the worst pain I ever had and I had a major surgery with insane physical pain back in 2022 that left me on crutches and on opiates for 6 months (tilidine 100mg half of the time then 50mg). I never became an opiate addict. I took it as long as I had to to fully recover, then I could stop them within a week of a quick taper without ANY withdrawals whatsoever. I was surprised but after that I never had the intent to take opiates again for other reasons such as having had an accident or surgery or being a terminal cancer patient.
The shit that happened to me in March rendered me a severe fiend, sad but true. It's MISuse of the substance class which left me as an opiate addict.
What I want to add is that even if you have a tolerance, you still get pain reduction and slight increase of mood (depending on the opiate) even if you take a low dose for a looong time and never up the antics.
To elaborate about my experience before I got into the program; I became a daily user almost immediately bc I needed pain suppression daily, the first few days I took the same dose, I liked the nod but preferred the pain reduction over the euphoria so I thought "I had it under control" but my pain was so intense that I had to up the antic, I never looked for a good nod but I just had to go further and further to survive each day. If I look from day one to the last day I used illicit opiates from the internet, I must say it's probably around 15x of the initial dose. So a very very rapid decline.
Beware of that. If you get along with a low dose of OXY (which I guess it is if you say 10mg). Perfect, prescriped by the doctors? perfect bro I am fucking jealous. I wish I could trade shoes with you ANY DAY.
I can only enforce your use then, trust me, you will have no cognitive long term effects, my 6 months tilidine phase left me with 000000 side effects except for slightly diminished libido that quickly resolved after jumping off (my T levels came back to above normal for my age) - and at that time I was glad that I wasn't plagued by it (libido is one of my biggest mental struggles as I can't live it out and gives me even more PTSD and flashbacks of the girl I loved so so much and lost me... it's like a horror haunting every day, so I am glad that's still low on substitution now but ngl I am afraid what the future holds for me once I am off it completely

... for now I try to convince the doctors to give me a little bit more time each step to postpone it.
If you do care about libido and relationship emotional binding: that's the only long-term effect of your use, congnitively you will have no neurotxic affect AT ALL. In fact, straight after my 6 months tilidine use (not abuse) I studied 12h a day for half a year and passed one of Europes hardest entrance test to a med school with a very very remarkable 100% on the big "memory subtest", which left me top 1-2% of all participants. (that's btw why I don't believe the myth of opiates causing memory issues long term... definitely not in my case by ANY means)
So yea long story short; it's different but I am jealous of you fr. Just be careful that you don't ramp up the antics like me, but as you see I am very troubled young guy that is in the worst hell on Earth, been through it all, still suffer in it all day. It's awful.
All the best bro cheers
edit: oh didn't read Endone, had to look it up, yep it's Oxy as you said. If you stay at 10 and do good in life! all the best, sounds good to me!