Oh yes OP, I know exact how you feel. For me, it's related to the menopause.
I go to bed at 9pm, read for 1/2 hour or so, wake up at 6am if I'm lucky, but wake up as if I've had no sleep at all. I feel absolutely shattered despite being wide-awake, my body hurts, my brain is completely fuggy and I can't get going at all. I feel like a zombie et everything I do during the day is just a monumental effort. All I can do is drag myself until it's time to go to bed and start again.
The problem is quality of sleep and not getting enough deep and/or REM sleep. That's the repairing stages. Instead, I spend most of the night in light sleep.
I've done absurdly everything that is recommended to increase deep sleep, everything, to no avail. I've tried different meds but none have been the miracle cure.
I'm in a constant state of hyper-arousal in my case due to hormones which I can't control with brain power!
Sorry, I don't have a suction except that in your case, it might be that you indeed suffer from a lifestyle that is too stimulating and the only solution is to make changes in your life to do less, which might feel I possible but ultimately will be imposed on you as you'll get to the point you just can't keep going.
I haven't tried antidepressants yet, I am not clinically depressed at all, but doing some research and antidepressants are not just about depression but also relaxing the brain. It's just hard to know which is est to try as there are so many.
Chronic insomnia is hell. It's so hard to explain to people how it impacts on everything in our life.